Answer:
18 in
Step-by-step explanation:
len = y
width= y - 6
the area of rectangle is len x width
(Y) x (Y-6) = 216
Y^2 - 6Y = 216, Y^2 - 6y -216 = 0
y = (36 /2) or (-24 /2)
len couldn't be negative so 18
Assume that ELY1X2 X1. .... Xp- xp) = Bo + B *1 + B2X2 + ... + Boxe is true and that the errorums are id random vanables having moano Further assume that with relative to not necessarily that p > but peos something similar to p/5) With regard to the bus variance trade-off which of the following statements as the most crate common of OLSrogression and regression using a CAM with a cubic pline representation for each predictor O A Both mothods are unbiased, and OLS regression has lower O D. Both methods and regression were O COLS rogression has both lower band lower O D.Regression using the CAM has lower basand OLS regression has lower vanane O E OLSrogression has both lower bias lower variance OF OLS regression as towerblers and regression using the GAM bas lower vasaron Assume that E{Y|X1 = X1...... Xp - xp) = Bo + B,X1 + B2X2 + ... + BpXp is true and that the error terms are lid random variables having mean 0. Further assume that p is largish relative to n. (Not necessarily that p> n, but perhaps something similar to p = n/5) With regard to the blas-variance trade-off which of the following statements is the most accurate comparison of OLS regression and regression using a GAM with a cubic spline representation for each predictor? O A. Both methods are unbiased, and OLS regression has lower variance O B. Both methods are unbiased and regression using the GAM has lower valanca OC.OLS regression has both lower blas and lower variance D. Regression using the GAM has lower bins and OLS regression has lower variance OE OLS regression has both lower blas and lower variance OF OLS regression has lower blas and regression using the GAM has lower varianco
The most accurate comparison of OLS regression and regression using a GAM with a cubic spline representation for each predictor is: B. Both methods are unbiased, and regression using the GAM has lower variance.
How to explain the regressionIt is stated that both methods are unbiased, meaning they provide estimates that, on average, are equal to the true values. However, when it comes to the bias-variance trade-off, regression using the GAM with a cubic spline representation is expected to have lower variance compared to OLS regression.
This indicates that regression using the GAM is likely to have reduced overfitting and better performance in terms of variability.
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what is the value of the quantity negative one seventh cubed all raised to the power of negative 3
The value of the quantity negative one seventh cubed ((-1/7)^3) all raised to the power of -3 is -343.
To calculate this, we first evaluate (-1/7)^3, which means raising -1/7 to the power of 3. This gives us (-1/7)^3 = -1/343. Next, we raise -1/343 to the power of -3. When a number is raised to a negative exponent, it means taking the reciprocal of the number raised to the positive exponent. So, (-1/343)^-3 is equal to 1/(-1/343)^3, which simplifies to 1/(-1/343 × -1/343 × -1/343) = 1/(-1/337633). Simplifying further, we get -343. The reciprocal of -1/343 is -343, and cubing it gives us -343 * -343 * -343 = -7, which is the final answer.
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The value of negative one seventh cubed, all raised to the power of negative three, is -40,353,607.
Explanation:This problem involves the concept of exponents. The quantity
negative one seventh
cubed means multiplying negative one seventh by itself twice, resulting in negative one over three hundred and forty three. Then this result is raised to the power of negative three. The negative exponent means that we will take the reciprocal of negative one over three hundred and forty three, which results in
negative three hundred and forty three
. Then this is cubed, giving our final result,
-40,353,607
.
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A park ranger is interested in plant growth around the trails of the park. He finds the plants growth, G, is dependent on the number of sunny days that occur in three months, x, and can be modeled by the function G(x)=−8+3x.
Draw the graph of the growth function by plotting its G-intercept and another point
The graph of the growth function is a straight line with points (0, -8) and (2, -2).
What is the formula to calculate the compound interest on an investment?To explain it further, the growth function G(x) = -8 + 3x represents the relationship between the number of sunny days (x) in three months and the corresponding plant growth (G).
The G-intercept, which is the point where the graph intersects the y-axis, is represented by the point (0, -8).
This means that when there are no sunny days (x = 0), the plant growth is at -8.
Another point on the graph can be obtained by selecting a value for x and calculating the corresponding value for G(x).
For example, if we choose x = 2, substituting it into the equation gives us G(2) = -8 + 3(2) = -8 + 6 = -2. So, the point (2, -2) represents the plant growth when there are 2 sunny days in three months.
By plotting these two points on a coordinate plane and connecting them with a straight line, you can visualize the graph of the growth function.
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Use a software program or a graphing utility with matrix capabilities to find the transition matrix from B to B'. B = {(2,5), (1, 2)}, B' = {(2,5), (1,5)}
The transition matrix from basis B to basis B' is a 2x2 matrix with the elements [1 0; 3 1].
To find the transition matrix from basis B to basis B', we need to express the basis B' vectors in terms of the basis B vectors. Let's label the basis B vectors as v1 and v2, and the basis B' vectors as w1 and w2.
Given B = {(2, 5), (1, 2)} and B' = {(2, 5), (1, 5)}, we can express w1 and w2 in terms of v1 and v2 as follows:
w1 = 2v1 + 0v2
w2 = 3v1 + 1v2
To obtain the transition matrix, we arrange the coefficients of v1 and v2 in each equation into a matrix. The first column corresponds to the coefficients of v1, and the second column corresponds to the coefficients of v2. Therefore, the transition matrix from B to B' is:
[2 0;
3 1]
This 2x2 matrix represents the linear transformation that maps vectors from the basis B to the basis B'.
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In GF(2 8), find the multiplicative inverse of
(x6 +x5+x2+1) modulo (x
8 + x 6 + x 5 + x 2 +
1). Use Euclidean table to show the intermediate steps
The multiplicative inverse of (x^6 + x^5 + x^2 + 1) modulo (x^8 + x^6 + x^5 + x^2 + 1) in GF(2^8) is (x^7 + x^4 - x - 1).
We are given the polynomial (x^6 + x^5 + x^2 + 1) and we want to find its multiplicative inverse modulo (x^8 + x^6 + x^5 + x^2 + 1) in GF(2^8).
Perform polynomial division
We divide the modulo polynomial by the given polynomial:
(x^8 + x^6 + x^5 + x^2 + 1) = (x^6 + x^5 + x^2 + 1)(x^2 + x) + (x^5 + x^2 + 1)
We have obtained the remainder (x^5 + x^2 + 1) and updated the polynomials.
Continue polynomial division
We divide the previous divisor (x^6 + x^5 + x^2 + 1) by the remainder:
(x^6 + x^5 + x^2 + 1) = (x^5 + x^2 + 1)(x + 1) + (x^4 + x^3 + 1)
Again, we have obtained the remainder (x^4 + x^3 + 1) and updated the polynomials.
Repeat division
We continue dividing the previous divisor by the remainder:
(x^5 + x^2 + 1) = (x^4 + x^3 + 1)(x + 1) + (x^3 + x + 1)
Once again, we have obtained the remainder (x^3 + x + 1) and updated the polynomials.
Final division
We continue dividing the previous divisor by the remainder:
(x^4 + x^3 + 1) = (x^3 + x + 1)(x + 1) + 0
At this point, the remainder is zero, and we have reached the end of the Euclidean algorithm.
Finding the inverse
Now, we need to find the Bezout coefficients to determine the inverse. We can work our way up to the given equation, replacing the remainders with the previous polynomials, as follows:
(x^4 + x^3 + 1) = (x^5 + x^2 + 1) - (x^3 + x + 1)(x + 1)
(x^3 + x + 1) = (x^6 + x^5 + x^2 + 1) - [(x^8 + x^6 + x^5 + x^2 + 1) - (x^6 + x^5 + x^2 + 1)(x^2 + x) - (x^5 + x^2 + 1)](x + 1) - (x^5 + x^2 + 1)
(x^3 + x + 1) = (x^6 + x^5 + x^2 + 1) - (x^8 + x^6 + x^5 + x^2 + 1)(x + 1) + (x^6 + x^5 + x^2 + 1)(x^2 + x)(x + 1) + (x^5 + x^2 + 1)(x + 1) - (x^5 + x^2 + 1)
Simplifying the above equation, we obtain:
(x^3 + x + 1) = x^6 + x^7 + x^4 + x^3 + 1
0 = x^7 + x^4 - x - 1
Therefore, the multiplicative inverse of (x^6 + x^5 + x^2 + 1) modulo (x^8 + x^6 + x^5 + x^2 + 1) in GF(2^8) is (x^7 + x^4 - x - 1).
The intermediate steps of the Euclidean algorithm are shown to illustrate how we arrived at the inverse.
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after the student finished walking, what is her horizontal displacement?
To determine the horizontal displacement of the student after she finished walking, we need more information about the student's path or trajectory.
The horizontal displacement refers to the change in the student's position along the x-axis. It can be calculated by subtracting the initial x-coordinate from the final x-coordinate.
If we are given the coordinates of the starting point and the ending point of the student's walk, we can subtract the initial x-coordinate from the final x-coordinate to find the horizontal displacement.
However, without specific information about the student's path or trajectory, we cannot determine the horizontal displacement. It would depend on the specific scenario or problem given.
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A consumer's utility is described by U(x; y)=xy. Marginal utilities then are described as MUX = y and MUY x Suppose the price of x is 1 and the price of y is 2 Consumer's Income is 40. Then price of y falls to 1. When graphing make sure to put x on the horizontal axis, and y on the vertical axis.
(a) Calculate the optimal consumption choice before the price change. Illustrate that choice on a graph. Label that choice A
Before the price change, the optimal consumption choice (A) is determined by the equalization of marginal utilities.
Before the price change, the consumer's utility function is U(x, y) = xy, and the marginal utilities are MUX = y and MUY = x. The consumer faces prices of Px = 1 and Py = 2, with an income of 40.
To determine the optimal consumption choice, the consumer maximizes utility while considering the budget constraint. Using the marginal utility equalization condition, MUX/Px = MUY/Py, we have y/1 = x/2, which simplifies to y = x/2. With an income of 40, the consumer's budget constraint is Px * x + Py * y = 40, substituting the prices and the utility equalization condition, we have x + 2(y) = 40, which further simplifies to x + 2(x/2) = 40, resulting in x + x = 40, giving x = 20. Substituting x = 20 into the utility equalization condition, we find y = 20/2 = 10.
Therefore, the optimal consumption choice before the price change is (x, y) = (20, 10), which we label as point A on the graph.
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15. Give an example of disjoint closed sets F, F, such that 0 inf{|x; – xzl : x; € F;}.
The example of disjoint closed sets F and G such that inf{|x - y| : x ∈ F, y ∈ G} = 2 is F = {x ∈ ℝ : x ≥ 1} and G = {x ∈ ℝ : x ≤ -1}.
Whst is an an example of the disjoint closed sets?Let's consider the set F = {x ∈ ℝ : x ≥ 1} and G = {x ∈ ℝ : x ≤ -1}. Both F and G are closed sets.
In order to show that they are disjoint, we can observe that for any x ∈ F, we have x ≥ 1, and for any x ∈ G, we have x ≤ -1. Therefore, there is no value of x that satisfies both conditions simultaneously, which means F and G have no common elements and are disjoint.
Now, let's calculate the infimum of the absolute difference |x - y| for all x ∈ F and y ∈ G:
inf{|x - y| : x ∈ F, y ∈ G}
Since F consists of values greater than or equal to 1, and G consists of values less than or equal to -1, the absolute difference between any x ∈ F and y ∈ G will always be greater than or equal to 2:
|x - y| ≥ |1 - (-1)| = 2
Therefore, the infimum of the absolute difference is 2.
In summary, the example of disjoint closed sets F and G such that inf{|x - y| : x ∈ F, y ∈ G} = 2 is F = {x ∈ ℝ : x ≥ 1} and G = {x ∈ ℝ : x ≤ -1}.
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A veterinarian has collecied data on the ille spans of a rare breed of cats.
Life Spans (in years)
16 18 19 12 11 15 20 21 18 15 16 13 16 22 18 19
17 14 9 15 19 20 15
Determine the mean, standard deviation, and he valance for these data.
The mean life span of the rare breed of cats is approximately 15.87 years, with a standard deviation of approximately 3.43 years and a variance of approximately 11.78 years squared. These statistics provide insights into the average life span and the spread of life spans within the data set.
The mean is the average of a set of numbers. To find the mean, we sum up all the life spans and divide it by the total number of data points. In this case, we have 23 data points. Summing up the life spans, we get a total of 365 years. Dividing 365 by 23, we find that the mean life span is approximately 15.87 years.
The standard deviation measures the spread or dispersion of the data points around the mean. It quantifies how much the individual life spans deviate from the mean. Calculating the standard deviation involves several steps, including finding the deviations from the mean, squaring them, summing them up, dividing by the number of data points, and finally taking the square root.
Using the formula, the standard deviation for this data set is approximately 3.43 years. The variance is another measure of the spread of the data. It is equal to the square of the standard deviation. So, squaring the standard deviation of 3.43, we find that the variance is approximately 11.78 years squared.
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Pollster problem. You plan to conduct a poll to determine the fraction of people interested in your new product. a. Suppose you ask n people if they are interested in your new product. Let x;s denote the answers for i € {1,...,n}. (X; = 1 means they are interested and X; = 0 means they are not). Given the responses, how would you estimate the fraction of people interested in your new product? b. Let W, denote your estimate based on n responses above. Using the Chebyshev inequality, find a lower bound for the number of people needed to ensure that P{\W – W, < 0.05) > 0.95, where W denotes the actual underlying fraction of people interested in your product. C. Approximate the distribution of n(Wn-W) using the CLT. Assume that the variance of W is 1/4. d. Using the CLT, determine an approximate lower bound for the number of people needed to ensure that P{\W - W. < 0.05) > 0.95, where W denotes the actual underlying fraction of people interested in your product. Hint: use the Q function table.
To estimate the fraction of people interested in your new product, you can use the sample proportion. By dividing the number of people interested (sum of x's equal to 1) by the sample size, you can obtain an estimate of the underlying fraction.
The Chebyshev inequality can be used to find a lower bound on the sample size required to ensure a certain level of confidence in the estimate. The Central Limit Theorem (CLT) allows us to approximate the distribution of n(Wn - W) as a normal distribution, where Wn is the sample proportion and W is the true fraction of people interested. By using the CLT, we can determine an approximate lower bound on the sample size required to ensure a desired level of confidence.
a. To estimate the bf people interested in the new product, calculate the sample proportion (Wn) by dividing the sum of x's equal to 1 by the sample size (n). The sample proportion gives an estimate of the underlying fraction of interest.
b. The Chebyshev inequality states that for any random variable with finite variance, the probability that it deviates from its mean by more than k standard deviations is at most 1/k^2. In this case, we want to ensure that P(|W - Wn| < 0.05) > 0.95. By setting k = 0.05/(standard deviation of Wn), we can find the corresponding lower bound on the sample size needed.
c. The CLT states that for a sufficiently large sample size, the distribution of n(Wn - W) approaches a normal distribution with mean 0 and variance (1/4)*(1/n), where Wn is the sample proportion. This approximation allows us to use normal distribution properties to estimate probabilities.
d. By using the CLT approximation, we can find the sample size required to ensure P(|W - Wn| < 0.05) > 0.95. We can use the Z-table or Q-function table to find the corresponding Z-value for the desired level of confidence and calculate the lower bound on the sample size using the formula n ≥ (Z-value * standard deviation of Wn / 0.05)^2.
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Solve the following system of initial value problem by using Laplace transform (a) y1 ′ + 3y2 = −2 , − 3y1 + y2 ′ = 2 , y1 (0) = 1, y2 (0) = 0 (b) y1 ′ − y2 = , y1 + y2 ′ = − , y1 (0) = 1, y2 (0) = 0 (c) y1 ′ − 4y2 = −8 cos 4, 3y1 + y2 ′ = − sin 4, y1 (0) = 0, y2 (0) = 3 (d) y1 ′ − y2 = 1 + , y1 + y2 ′ = 1, y1 (0) = 1, y2 (0) = 0
After considering the given data, the initial value generated for the given functions after applying Laplace transform are
a) [tex]y_2(t) = (1/3)e^{(-3t)} [-2cos(\sqrt(8)t) + sin(\sqrt(8)t)][/tex]
[tex]y_1(t) = (1/3)e^{(-3t)} [2cos(\sqrt(8)t) + sin(\sqrt(8)t)][/tex]
b) [tex]y_2(t) = (1/2)e^{(-t)} [\sqrt(3)cosh(\sqrt(3)t) + sinh(\sqrt(3)t)][/tex]
[tex]y_1(t) = (1/2)e^{(-t)} [cosh(\sqrt(3)t) + \sqrt(3)sinh(\sqrt(3)t)][/tex]
c) [tex]y_2(t) = (-1/32)cos(4t) - (1/16)sin(4t) + (3/16)tcos(4t) + (3/16)sin(4t)[/tex]
[tex]y_1(t) = (3/32)sin(4t) - (3/16)tcos(4t)[/tex]
d) [tex]y_1(t) = (1/3) [cos(t) + sin(t) + e^{(-t)} ][/tex]
[tex]y_2(t) = (1/3) [e^{(-t)} - cos(t) + sin(t)][/tex]
To evaluate the given system of initial value problems apply Laplace transform, we need to take the Laplace transform of both sides of the equations, apply the properties of Laplace transform, and then solve for the Laplace transform of the solution.
Finally, we need to take the inverse Laplace transform to obtain the solution in the time domain.
(a) [tex]y_1 + 3y_2 = - 2 , - 3y_1 + y_2 = 2 , y_1 (0) = 1, y_2 (0) = 0[/tex]
Giving the Laplace transform of both sides of the equations, we get:
[tex]sY_1(s) - y_1(0) + 3Y_2(s) = -2/s[/tex]
[tex]-3Y_1(s) + sY_2(s) - y_2(0) = 2/s[/tex]
Staging the initial conditions, we get:
[tex]sY_1(s) + 3Y_2(s) = -2/s + 1[/tex]
[tex]-3Y_1(s) + sY_2(s) = 2/s[/tex]
Evaluating for [tex]Y_1(s)[/tex] and [tex]Y_2(s)[/tex], we get:
[tex]Y_1(s) = (2s + 3) / (s^2 + 3s + 9)[/tex]
[tex]Y_2(s) = (2 - 2s) / (s^2 + 3s + 9)[/tex]
Giving the inverse Laplace transform, we get:
[tex]y_1(t) = (1/3)e^{(-3t)} [2cos(\sqrt(8)t) + sin(\sqrt(8)t)][/tex]
[tex]y_2(t) = (1/3)e^{(-3t)} [-2cos(\sqrt(8)t) + sin(\sqrt(8)t)][/tex]
(b) [tex]y_1' - y_2 = , y_1 + y_2 ' = - , y_1 (0) = 1, y_2 (0) = 0[/tex]
Placing the Laplace transform of both sides of the equations, we get:
[tex]sY_1(s) - y1(0) - Y_2(s) = 1/s[/tex]
[tex]Y_1(s) + sY_2(s) - y_2(0) = -1/s[/tex]
Staging the initial conditions, we get:
[tex]sY_1(s) - Y_2(s) = 1/s + 1[/tex]
[tex]Y_1(s) + sY_2(s) = -1/s + 1[/tex]
Solving for [tex]Y_1(s)[/tex] and [tex]Y_2(s)[/tex], we get:
[tex]Y_1(s) = (s^2 - 1) / (s^3 + s)[/tex]
[tex]Y_2(s) = (1 - s^2) / (s^3 + s)[/tex]
Taking the inverse Laplace transform, we get:
[tex]y_1(t) = (1/2)e^{(-t)} [cosh(\sqrt(3)t) + \sqrt(3)sinh(\sqrt(3)t)][/tex]
[tex]y_2(t) = (1/2)e^{(-t)} [\sqrt(3)cosh(\sqrt(3)t) + sinh(\sqrt(3)t)][/tex]
(c) [tex]y_1'- 4y_2 = - 8 cos 4, 3y_1 + y_2'= - sin 4, y_1 (0) = 0, y_2 (0) = 3[/tex]
Taking the Laplace transform of both sides of the equations, we get:
[tex]sY_1(s) - y_1(0) - 4Y_2(s) = -8 / (s^2 + 16)[/tex]
[tex]3Y_1(s) + sY_2(s) - y_2(0) = -1 / (s^2 + 16)[/tex]
Staging the initial conditions, we get:
[tex]sY_1(s) - 4Y_2(s) = -8 / (s^2 + 16)[/tex]
[tex]3Y_1(s) + sY_2(s) = -1 / (s^2 + 16) + 3[/tex]
Solving for [tex]Y_1(s)[/tex] and [tex]Y_2(s)[/tex], we get:
[tex]Y_1(s) = (3s - 8sin(4)) / (s^2 + 16)^2[/tex]
[tex]Y_2(s) = (-s - cos(4) + 3sin(4)) / (s^2 + 16)^2[/tex]
Taking the inverse Laplace transform, we get:
[tex]y_1(t) = (3/32)sin(4t) - (3/16)tcos(4t)[/tex]
[tex]y_2(t) = (-1/32)cos(4t) - (1/16)sin(4t) + (3/16)tcos(4t) + (3/16)sin(4t)[/tex]
(d) [tex]y1'- y_2 = 1 + , y_1 + y_2'= 1, y_1 (0) = 1, y_2 (0) = 0[/tex]
Taking the Laplace transform of both sides of the equations, we get:
[tex]sY_1(s) - y_1(0) - Y_2(s) = 1 / (s^2)[/tex]
[tex]Y_1(s) + sY_2(s) - y_2(0) = 1/s[/tex]
Staging the initial conditions, we get:
[tex]sY_1(s) - Y_2(s) = 1 / (s^2) + 1[/tex]
[tex]Y_1(s) + sY_2(s) = 1/s + 1[/tex]
Solving for [tex]Y_1(s)[/tex] and [tex]Y_2(s)[/tex], we get:
[tex]Y_1(s) = (s^2 + s + 1) / (s^3 + s)[/tex]
[tex]Y_2(s) = (s - 1) / (s^3 + s)[/tex]
Taking the inverse Laplace transform, we get:
[tex]y_1(t) = (1/3) [cos(t) + sin(t) + e^{(-t)} ][/tex]
[tex]y_2(t) = (1/3) [e^{(-t)} - cos(t) + sin(t)][/tex]
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A digital filter H(2) having two zeros at z = -1 and poles at z = fja is obtained from an analog counterpart by applying Bilinear transformation. Here'a'is real and is bounded by 0.5 < a < 1 a. Sketch an approximate plot of |HW|versus w (10 Marks) b. Evaluate H(s)and express it as a ratio of two polynomials, with 'a' and T as parameters.
a. Plot of H([tex]\omega[/tex]) = [tex]\frac{(1+e^{j\omega})^{2} }{a^{2}+ e^{j2\omega} }[/tex]
b. The transfer function of the analog filter, H(s) = Z = [tex][\frac{ST + 2}{ST-2}][/tex]
a) Given that,
Two zeroes are at z = -1
Poles at z = ±ja
Zeros: The zeros at z = -1 correspond to zeros at ω = 0 in the frequency domain. Therefore, we have two zeros at ω = 0.
Poles: The poles at z = ±ja correspond to poles on the imaginary axis in the frequency domain. Since a is bounded by 0.5 < a < 1, the poles will lie within the unit circle in the z-plane.
So, H(z) is
H(z) = [tex]\frac{(z+1)^{2} }{(z+ja)(z-ja)}[/tex]
H(z) = [tex]\frac{(1+z)^{2} }{z^{2} +a^{2} }[/tex]
Put, z = [tex]e^{j\omega}[/tex]
H([tex]\omega[/tex]) = [tex]\frac{(1+e^{j\omega})^{2} }{a^{2}+ e^{j2\omega} }[/tex]
b) As we know that in bilinear transformation,
S = [tex]\frac{2}{T}(\frac{1+Z^{-1} }{1-Z^{-1} } )[/tex]
or,
S = [tex]\frac{2}{T}(\frac{Z+1}{Z-1} )[/tex]
ST(Z - 1) = 2(Z + 1)
Z(ST - 2) = ST + 2
Z = [tex][\frac{ST + 2}{ST-2}][/tex]
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To estimate the variance of fill at a cannery, 10 cans were selected at random and their contents are weighed. The following data were obtained ( in ounces): 7.96, 7.90, 7.98, 8.01, 7.97, 7.96, 8.03, 8.02, 8.04, 8.02. Construct a 90% confidence interval for estimating the variance assuming that contents are normally distributed
We can state with 90% certainty that the cannery's actual fill variance lies between 0.001 and 0.005.
What is the confidence interval?Using the chi-square distribution;
Given the data:
n = 10 (number of cans)
Sample weights: 7.96, 7.90, 7.98, 8.01, 7.97, 7.96, 8.03, 8.02, 8.04, 8.02
Sample mean (x):
x = (7.96 + 7.90 + 7.98 + 8.01 + 7.97 + 7.96 + 8.03 + 8.02 + 8.04 + 8.02) / 10 = 7.987
Sample variance (s²):
s² = [(7.96 - 7.987)² + (7.90 - 7.987)² + ... + (8.02 - 7.987)²] / (n - 1)
s² = 0.0015
Chi-square critical values:
The chi-square critical values are:
χ²_lower = 3.325
χ²_upper = 19.023
Confidence interval:
The confidence interval for estimating the variance is given by:
[(n - 1) * s² / χ²_upper, (n - 1) * s² / χ²_lower]
Confidence interval = [(10 - 1) * 0.0015 / 19.023, (10 - 1) * 0.0015 / 3.325]
= [0.000748, 0.004949]
The 90% confidence interval for estimating the variance is [0.001, 0.005].
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A real estate magazine reported the results of a regression analysis designed to predict the price (y), measured in dollars, of residential properties recently sold in a northern Virginia subdivision. One independent variable used to predict sale price is GLA, gross living area (x), measured in square feet. Data for 157 properties were used to fit the model Ely) = Bo + B1x. The results of the simple linear regression are provided below. y = 96,600 + 22.5x 5 = 6500 R 2 = 77 t = 6.1 (for testing B1) Interpret the value of the coefficient of determination, R2 There is a moderately strong positive correlation between sale price (y) and GLA (x). GLA (x)is linearly related to sale price (y) 77% of the time. 77% of the observed sale prices (y's) will fall within 2 standard deviations of the least squares line. 77% of the total variation in the sample sale prices can be attributed to the linear relationship between GLA (x) and (y).
The coefficient of determination, R^2, represents the proportion of the total variation in the dependent variable (sale price, y) that can be explained by the independent variable (gross living area, GLA, x) in a linear regression model.
In this case, the given value of R^2 is 0.77 (or 77%). This means that approximately 77% of the total variation in the sale prices of the properties in the sample can be attributed to the linear relationship between the gross living area and the sale price.
Interpreting this value:
- The value of 0.77 indicates a relatively high coefficient of determination. It suggests that the model is able to explain a significant portion of the variability in sale prices based on the variation in the gross living area.
- The higher the R^2 value, the more accurately the model can predict the sale prices based on the gross living area.
- In this case, the linear regression model with the gross living area as the independent variable accounts for 77% of the observed variation in sale prices.
It is important to note that the coefficient of determination, R^2, does not indicate causality but rather the strength of the linear relationship and the proportion of the variability explained by the model.
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Let {Xt: t > 0} and {Yt: t≥ 0} be two martingales in respect to the same filtration. Prove that the process {Xt/Yt: t ≥ 0} is a supermartingale.
The two martingales will help to prove that supermartingale.
Let {Xt: t > 0} and {Yt: t≥ 0} be two martingales in respect to the same filtration.
To prove that the process {Xt/Yt: t ≥ 0} is a supermartingale, we can use the definition of a supermartingale.
Let Zt = Xt/Yt.
Then, Zt is a non-negative process (since Xt and Yt are both non-negative) and we need to show that E[Zt+1 | Ft] ≤ Zt for all t and all Ft ⊆ Fs
In order to do this, we first use the product rule of conditional expectation to write:
E[Zt+1 | Ft] = E[Xt+1/Yt+1 | Ft]
Now, since Xt and Yt are both martingales, we know that E[Xt+1 | Ft] = Xt and E[Yt+1 | Ft] = Yt.
So, we can rewrite the above expression as
E[Zt+1 | Ft] = Xt/Yt = Zt
Since Zt is non-negative, this implies that E[Zt+1 | Ft] ≤ E[Zt | Ft], which is the definition of a supermartingale.
Therefore, we have shown that the process {Xt/Yt: t ≥ 0} is a supermartingale.
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The following sample data have been collected based on a simple random sample from a normally distributed population: 4 6 3 2 5 6 7 2 3 2 Compute a 95% confidence interval estimate for the population mean. 0,5,9) = 2.2622
The confidence interval is ( 2.902871971 7.297128029 )
Thus, the confidence interval is ( 2.359668581 , 7.840331419 )
a)
Note that
Lower Bound = X - t(alpha/2) * s / sqrt(n)
Upper Bound = X + t(alpha/2) * s / sqrt(n)
where
alpha/2 = (1 - confidence level)/2 = 0.025
X = sample mean = 5.1
t(alpha/2) = critical t for the confidence interval = 2.262157163
s = sample standard deviation = 3.0713732
n = sample size = 10
df = n - 1 = 9
Thus,
Lower bound = 2.902871971
Upper bound = 7.297128029
Thus, the confidence interval is
( 2.902871971 , 7.297128029 ) [ANSWER]
b)
Note that
Lower Bound = X - t(alpha/2) * s / sqrt(n)
Upper Bound = X + t(alpha/2) * s / sqrt(n)
where
alpha/2 = (1 - confidence level)/2 = 0.01
X = sample mean = 5.1
t(alpha/2) = critical t for the confidence interval = 2.821437925
s = sample standard deviation = 3.0713732
n = sample size = 10
df = n - 1 = 9
Thus,
Lower bound = 2.359668581
Upper bound = 7.840331419
Thus, the confidence interval is
( 2.359668581 , 7.840331419 )
As we can see, the interval became wider, and the margin of error became larger.
This is so because the critical t value becomes larger with larger confidence level.
This makes sense because you need to enclose more values to be "more confident" that you have the true mean.
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Listen Now Radio conducted a study to determine the average lengths of songs by Australian artists. Based on previous studies, it was assumed that the standard deviation of song lengths was 7.2 seconds. Listen Now Radio sampled 64 recent Australian artists' songs and found the average song length was 4.5 minutes. Construct a 92% confidence interval for the average lengths of songs by Australian artists. Report the upper limit in seconds to 2 decimal places.
Listen Now Radio sampled 64 recent Australian artists' songs and found that the average song length was 4.5 minutes. The standard deviation of song lengths was assumed to be 7.2 seconds. Now we need to construct a 92% confidence interval for the average lengths of songs by Australian artists, reporting the upper limit in seconds.
To construct the confidence interval, we can use the formula:
Confidence Interval = Sample Mean ± (Critical Value * Standard Error)
The critical value can be found using the Z-table or a Z-table calculator. For a 92% confidence level, the critical value is approximately 1.75.
The standard error is calculated by dividing the standard deviation by the square root of the sample size:
Standard Error = Standard Deviation / √(Sample Size)
In this case, the standard deviation is 7.2 seconds, and the sample size is 64.
Substituting the values into the formula, we get:
Standard Error = 7.2 / √(64) ≈ 0.9 seconds
Now we can calculate the confidence interval:
Confidence Interval = 4.5 minutes ± (1.75 * 0.9 seconds)
Converting 4.5 minutes to seconds gives us 270 seconds:
Confidence Interval = 270 seconds ± (1.75 * 0.9 seconds)
Calculating the upper limit:
Upper Limit = 270 seconds + (1.75 * 0.9 seconds)
Upper Limit ≈ 271.58 seconds (rounded to 2 decimal places)
Therefore, the upper limit of the 92% confidence interval for the average lengths of songs by Australian artists is approximately 271.58 seconds.
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About 6% of employed adults in the United States held multiple jobs. A random sample of 63 employed adults is chosen. Use the TI-84 Plus calculator as needed. (a) Is it appropriate to use the normal approximation to find the probability that less than 6.3% of the individuals in the sample hold multiple jobs? If so, find the probability. If not, explain why not.
No, it is not appropriate to use the normal approximation in this case.
To determine if it is appropriate to use the normal approximation, we need to check if the conditions for applying the normal distribution are satisfied. In this case, we are interested in the proportion of employed adults who hold multiple jobs.
The conditions for using the normal approximation for proportions are as follows:
1. Random Sample: The sample should be a random sample or a randomized experiment. In this case, it is mentioned that a random sample of 63 employed adults is chosen. This condition is satisfied.
2. Independence: The individuals in the sample should be independent of each other. If the sample size is no more than 10% of the population, this condition is generally satisfied. Since the population size is not provided, we assume it is large enough for the independence condition to hold.
3. Success/Failure: The sample size should be large enough so that there are at least 10 successes and 10 failures in the sample. This ensures that the distribution of the sample proportion is approximately normal. We need to check if np ≥ 10 and n(1-p) ≥ 10, where n is the sample size and p is the proportion of interest.
Given that the proportion of employed adults holding multiple jobs is 6%, we have p = 0.06. Checking the success/failure condition:
np = 63 * 0.06 = 3.78
n(1-p) = 63 * (1 - 0.06) = 59.22
Since np < 10 and n(1-p) < 10, the success/failure condition is not satisfied. Therefore, it is not appropriate to use the normal approximation in this case.
Instead, we should use the binomial distribution to find the probability. The binomial distribution directly models the probability of having a certain number of successes in a fixed number of trials (in this case, the proportion of employed adults holding multiple jobs in a sample).
Unfortunately, we cannot calculate the probability for "less than 6.3% of the individuals in the sample hold multiple jobs" directly, as the sample proportion is discrete. We can, however, find the probability of having 0, 1, 2, 3, etc., individuals holding multiple jobs, and then sum those probabilities up to find the probability of having less than 6.3%.
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find the y coordinate of a point on the line y=2x + 3 that is closest to the point 0,7
To find the y coordinate of a point on the line y = 2x + 3 that is closest to the point (0, 7), we need to follow the steps below:
Step 1: We have the equation of the line y = 2x + 3, which can also be written in slope-intercept form as y = mx + b, where m is the slope of the line and b is the y-intercept of the line.
Step 2: Find the slope of the line by comparing its equation with y = mx + b. From the equation, we can see that m = 2.
Step 3: Since we have the slope of the line, we can find the equation of a line perpendicular to it that passes through the point (0, 7). A line perpendicular to a line with slope m has a slope of -1/m.
Therefore, the slope of the perpendicular line is -1/2.
The equation of the perpendicular line passing through (0, 7) is y - 7 = (-1/2)(x - 0).
Simplifying, we get y = -x/2 + 7.
Step 4: The point of intersection of the line y = 2x + 3 and the line y = -x/2 + 7 is the point on the line y = 2x + 3 that is closest to the point (0, 7). Solving the system of equations y = 2x + 3 and y = -x/2 + 7, we get x = 1 and y = 5.
Step 5: Therefore, the y coordinate of the point on the line y = 2x + 3 that is closest to the point (0, 7) is 5.
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The solution of the system of differential equations:
dx / dt = -6x +5y + t
dy / dt = -5x +4y + 1
The solution to the system of differential equations dx/dt = -6x + 5y + t and dy/dt = -5x + 4y + 1 is given by the equations x(t) = C₁e⁻⁶ᵗ + C₂e⁴ᵗ - t - 1 and y(t) = C₁e⁻⁶ᵗ + C₂e⁴ᵗ + t + 2, where C₁ and C₂ are arbitrary constants.
To solve the system of differential equations dx/dt = -6x + 5y + t and dy/dt = -5x + 4y + 1, we can use the method of solving simultaneous linear first-order differential equations.
First, we solve for x(t):
Differentiating the equation dx/dt = -6x + 5y + t with respect to t, we get d²x/dt² = -6(dx/dt) + 5(dy/dt) + 1.Substituting the given expressions for dx/dt and dy/dt, we have d²x/dt² = -6(-6x + 5y + t) + 5(-5x + 4y + 1) + 1.
Simplifying, we get d²x/dt² = 36x - 30y - 6t + 25x - 20y - 5 + 1.
This simplifies further to d²x/dt² = 61x - 50y - 6t - 4.
Similarly, differentiating the equation dy/dt = -5x + 4y + 1 with respect to t, we get d²y/dt² = -5(dx/dt) + 4(dy/dt).
Substituting the given expressions for dx/dt and dy/dt, we have d²y/dt² = -5(-6x + 5y + t) + 4(-5x + 4y + 1).
Simplifying, we get d²y/dt² = 30x - 25y + 5t - 20x + 16y + 4.
This simplifies further to d²y/dt² = 10x - 9y + 5t + 4.So we have the system of equations d²x/dt² = 61x - 50y - 6t - 4 and d²y/dt² = 10x - 9y + 5t + 4.
By solving these second-order differential equations, we find that the general solution for x(t) is given by x(t) = C₁e⁻⁶ᵗ + C₂e⁴ᵗ - t - 1, and the general solution for y(t) is given by y(t) = C₁e⁻⁶ᵗ + C₂e⁴ᵗ + t + 2, where C₁ and C₂ are arbitrary constants.
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A circular mirror has a diameter of 10 inches, Part A what is the are, in square inches of the mirror? please give me the explanation also with the answer!!!
The area of the mirror is approximately 78.5 square inches.
The area of a circular mirror can be found using the formula:
A = π[tex]r^2[/tex]
where `A` is the area of the mirror and `r` is the radius of the mirror.
In this case, we are given that the diameter of the mirror is 10 inches, so the radius would be half of that, or 5 inches.
Plugging in the value for `r`:
A = π[tex](5)^2[/tex] = 25π
Therefore, the area of the mirror is 25π square inches. Alternatively, we could use a value of approximately 3.14 for π to get:
A ≈ 78.5
In general, the area of a circle is proportional to the square of its radius, so the area of a circle with twice the radius of this mirror would be four times as large, and so on.
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A certain type of light bulb has an average life of 600 hours, with a standard deviation of 50 hours. The length of life of the bulb can be closely approximated by a normal curve. An amusement park buys and installs 40,000 such bulbs. Find the total number that can be expected to last more than 565 hours? Click here to view page 1 of the standard normal table. Click here to view page 2 of the standard normal table.The number of light bulbs that can be expected to last more than 565 hours is
To find the total number of light bulbs that can be expected to last more than 565 hours, we need to calculate the z-score and use the standard normal table.
The z-score is calculated using the formula:
z = (x - μ) / σ
Where x is the value we want to find the probability for (565 hours in this case), μ is the mean (average life of the bulb, which is 600 hours), and σ is the standard deviation (50 hours).
Substituting the values into the formula:
z = (565 - 600) / 50 = -0.7
Now, we need to find the probability associated with a z-score of -0.7 in the standard normal table. The standard normal table provides the area under the standard normal curve for different z-scores.
Using the table, we find that the area to the left of -0.7 is approximately 0.2420.
Since we want to find the number of bulbs that last more than 565 hours, we need to subtract this probability from 1:
1 - 0.2420 = 0.7580
So, approximately 75.80% of the bulbs are expected to last more than 565 hours.
To find the total number of bulbs that can be expected to last more than 565 hours, we multiply this probability by the total number of bulbs:
0.7580 * 40,000 = 30,320
Therefore, we can expect approximately 30,320 light bulbs to last more than 565 hours.
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The measure of the complement of the angle of measure 50 degree is......... .
The correct answer is 40°. The measure of the complement of the angle of measure 50 degrees is 40 degrees as the sum of 40° & 50° is 90°.
Complementary angles are a pair of angles whose sum is 90 degrees.
Therefore, the measure of the complement of the angle of measure 50 degrees can be found by subtracting 50 degrees from 90 degrees.
This is because the complement of the angle of measure 50 degrees is the other angle that, when added to 50 degrees, gives 90 degrees.
The measure of the complement of the angle of measure 50 degrees is 40 degrees.
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According to an ice cream store, 70% of their customers prefer chocolate milkshakes over other shakes. (a) If 300 customers of this store are randomly selected, how many would we expect to prefer a chocolate milkshake? (b) Would it be unusual to observe 270 customers of this store who prefer chocolate milkshakes in a random sample of 300 customers? Why? customers to prefer chocolate milkshakes. (a) We would expect about (Type a whole number.) (b) Would it be unusual to observe 270 customers who prefer chocolate milkshakes in a random sample of 300 customers? O A. Yes, because 270 is between u – 20 and + 20. B. No, because 270 is less than u - 20. C. No, because 270 is greater than u + 20. ооо D. No, because 270 is between u-20 and u + 20. E. Yes, because 270 is greater than u + 20.
a) 210 customers prefer chocolate milkshakes.
b) The correct option is E. Yes, because 270 is greater than u + 20.
a) If 300 customers of this store are randomly selected,
we can expect (0.70 x 300) = 210 customers to prefer chocolate milkshakes.
b) We are given that 70% of the store's customers prefer chocolate milkshakes.
Therefore, the population proportion for customers who prefer chocolate milkshakes is 0.70.
The expected value (µ) of customers who prefer chocolate milkshakes in a sample of size n = 300 would be:(µ) = np= 300 x 0.70= 210
The standard deviation of the sample distribution (σ) can be calculated using the formula:σ = sqrt(npq)
where q = 1 - p= 1 - 0.70= 0.30Thus,σ = sqrt(300 x 0.70 x 0.30)≈ 7.35
The z-score can be calculated using the formula:
z = (x - µ) / σwhere x = 270z = (270 - 210) / 7.35= 8.16
Since the calculated z-score of 8.16 is greater than 2 (which is considered to be unusual), it would be unusual to observe 270 customers of this store who prefer chocolate milkshakes in a random sample of 300 customers.
Therefore, the correct answer is E. Yes, because 270 is greater than u + 20.
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Let [2 1 A:= 1 2 1 = 1 and b:= 1 3 2=2 Find (a) all the least squares solutions of the linear system Ax = b; (b) the orthogonal projection projcol(A) b of b onto col(A); (c) the least squares error || b - projcol(a) b 11
(a) To find all the least squares solutions of the linear system Ax = b, we need to solve the normal equation (A^T A)x = A^T b. Let's compute the necessary matrices:
A^T = [2 1; 1 2; A] and A^T A = [6 4; 4 6; 4 4 + A²]
A^T b = [2 + A; 4 + 3A; 2 + 2A]
Substituting these values into the normal equation, we have:
[6 4; 4 6; 4 4 + A²]x = [2 + A; 4 + 3A; 2 + 2A]
Solving this system of equations will give us the values of x that satisfy the least squares criterion.
(b) To find the orthogonal projection projcol(A) b of b onto col(A), we can use the formula projcol(A) b = A(A^T A)^(-1) A^T b. We already have the matrices A^T A and A^T b from the previous step. Calculating (A^T A)^(-1) and substituting the values, we can compute projcol(A) b.
(c) The least squares error ||b - projcol(A) b|| can be found by subtracting the projection of b onto col(A) from b, and then calculating the norm of the resulting vector.
||b - projcol(A) b|| = ||b - A(A^T A)^(-1) A^T b||
Simplifying the expression using the matrices we computed in the previous steps, we can find the least squares error.
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If f(x)=16x-30 and g(x)=14x-6, for which value of x does (f-g)(x)=0?
12
13
14
The value of x for which (f - g)(x) = 0 is x = 12.
To find the value of x for which (f - g)(x) = 0, we need to subtract g(x) from f(x) and set the resulting expression equal to zero. Let's perform the subtraction:
(f - g)(x) = f(x) - g(x)
= (16x - 30) - (14x - 6)
= 16x - 30 - 14x + 6
= 2x - 24
Now, we can set the expression equal to zero and solve for x:
2x - 24 = 0
Adding 24 to both sides:
2x = 24
Dividing both sides by 2:
x = 12
Therefore, the value of x for which (f - g)(x) = 0 is x = 12.
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For each function, find the inverse function. Simplify your answers. f: x 9x -2 f-1(x) = 1 8 : x g++(x) = = 7x-3 X+5 h : x h'(x) = X - 3(5-4x) j : x ; (x) = = 2
The inverse function of f(x) = 9x - 2 is [tex]f^{(-1)x}[/tex] = (x + 2)/9. The inverse function of g(x) = 7x - 3 is [tex]g^{(-1)x}[/tex] = (x + 3)/7. The inverse function of h(x) = x - 3(5 - 4x) is [tex]h^{(-1)x}[/tex] = 13x - 15. The inverse function of j(x) = x + 5 is [tex]j^{(-1)x}[/tex] = x - 5.
Let's find the inverse functions for each given function:
a) f(x) = 9x - 2
To find the inverse function, we can follow these steps:
Replace f(x) with y: y = 9x - 2.
Swap x and y: x = 9y - 2.
Solve the equation for y: x + 2 = 9y.
Divide both sides by 9: (x + 2)/9 = y.
Replace y with [tex]f^{(-1)x}[/tex]: [tex]f^{(-1)x}[/tex]= (x + 2)/9.
Therefore, the inverse function of f(x) = 9x - 2 is [tex]f^{(-1)x}[/tex] = (x + 2)/9.
b) g(x) = 7x - 3
Following the same steps as above:
Replace g(x) with y: y = 7x - 3.
Swap x and y: x = 7y - 3.
Solve the equation for y: x + 3 = 7y.
Divide both sides by 7: (x + 3)/7 = y.
Replace y with [tex]g^{(-1)x}[/tex]: [tex]g^{(-1)x}[/tex]= (x + 3)/7.
Thus, the inverse function of g(x) = 7x - 3 is [tex]g^{(-1)x}[/tex] = (x + 3)/7.
c) h(x) = x - 3(5 - 4x)
Again, following the same steps:
Replace h(x) with y: y = x - 3(5 - 4x).
Swap x and y: x = y - 3(5 - 4x).
Solve the equation for y: x = y - 15 + 12x.
Collect like terms: 12x - y = 15 - x.
Solve for y: y = 12x + x - 15.
Combine like terms: y = 13x - 15.
Replace y with [tex]h^{(-1)x}[/tex]: [tex]h^{(-1)x}[/tex] = 13x - 15.
Thus, the inverse function of h(x) = x - 3(5 - 4x) is [tex]h^{(-1)x}[/tex] = 13x - 15.
d) j(x) = x + 5
Following the same steps as before:
Replace j(x) with y: y = x + 5.
Swap x and y: x = y + 5.
Solve the equation for y: y = x - 5.
Replace y with[tex]j^{(-1)x}[/tex]: [tex]j^{(-1)x}[/tex] = x - 5.
Therefore, the inverse function of j(x) = x + 5 is [tex]j^{(-1)x}[/tex] = x - 5.
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Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Round your final answers to 3 decimal places -195.x - 162: 90% condence
The formula for a confidence interval for a population proportion, p is;Upper bound: $$\hat{p} + z_{\alpha/2}\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$$Lower bound: $$\hat{p} - z_{\alpha/2}\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$$Where;$$\hat{p} = \frac{x}{n}$$Where; $x$ is the number of success and $n$ is the sample size.
Therefore, if $$\hat{p} = \frac{x}{n}$$Hence, $$\hat{p} = \frac{195}{195+162} = 0.546$$And, $$n = 195 + 162 = 357$$The value of $z_{\alpha/2}$ for 90% confidence is 1.645 (refer the table below).z1-a2α/2 0.0050.0100.0250.050.10.20.50.1 0.00 1.96 1.645 1.282 1.645 1.645 1.282 1.645 1.282 The confidence interval for the population proportion p is;Upper bound: $$\hat{p} + z_{\alpha/2}\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$$$$= 0.546 + 1.645\sqrt{\frac{0.546(1-0.546)}{357}}$$$$= 0.546 + 0.062$$$$= 0.608$$Lower bound:$$\hat{p} - z_{\alpha/2}\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$$$$= 0.546 - 1.645\sqrt{\frac{0.546(1-0.546)}{357}}$$$$= 0.546 - 0.062$$$$= 0.484$$
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Identify the population and propose an appropriate sample for the following survey question: How do the parents of the students at Rosedale Academy feel about visiting Canada?
Population: The population for this survey question would be the parents of the students at Rosedale Academy.
Sample: To obtain a representative sample of the parents' opinions, a stratified random sampling approach can be used. The school can divide the parents into different strata based on relevant factors such as grade level, nationality, or language spoken at home. Then, a random sample of parents can be selected from each stratum. This approach ensures that the sample represents the diversity within the parent population at Rosedale Academy. For example, if there are parents from different grade levels (e.g., elementary, middle, high school), the school can randomly select a proportionate number of parents from each grade level. Similarly, if there are parents from different nationalities or language backgrounds, the school can randomly select a proportionate number of parents from each group. By using stratified random sampling, the survey will capture the opinions of parents from different segments of the population, leading to a more comprehensive understanding of how parents at Rosedale Academy feel about visiting Canada.
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X
3
9
13
20
y
9
27
39
60
Show your work for finding the value of k below
point)
The constant k for the proportional relationship in this problem is given as follows:
k = 3.
What is a proportional relationship?A proportional relationship is a relationship in which a constant ratio between the output variable and the input variable exists.
The equation that defines the proportional relationship is a linear function with slope k and intercept zero presented as follows:
y = kx.
The slope k is the constant of proportionality, representing the increase or decrease in the output variable y when the constant variable x is increased by one.
The constant for this problem, considering the table, is given as follows:
k = 60/20 = ... = 27/9 = 3.
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