) The stem-and-leaf plot shows the ages of customers who were interviewed in a survey by a store w How many customers were older than 45? Ages of Store Customer

1 0 2 3 3 69 8
2 1 1 3 4 5 6 6 8 9
3 2 2 4 4 4 5 7
4 1 2 3 3 5 8
5 0 0 1 5 6
6 2 4 5 5
7 3

The calculated t-test for b1 is 2.09.

The relationship between Computer Sales and two types of Ads is analyzed by the regression equation

y=11.4 + 1.46x1 + 0.87x2

where y denotes the computer sales, x1 represents the first type of ads, and x2 represents the second type of ads.

It is given that the standard error for b1 = 0.70

We are required to find the calculated t-test for b1.

The t-value can be found using the formula:

t= b1 / SE(b1)

Where,

b1 = the slope for x1

SE(b1) = the standard error for b1

Substituting the given values in the above formula,t = 1.46 / 0.70 = 2.09

Therefore, the calculated t-test for b1 is 2.09.

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The aggregate expenditures line graph does not correctly illustrate the economy's equilibrium.

The graph fails to accurately represent the equilibrium because it assumes that aggregate expenditures are always equal to the total output or GDP. However, in reality, equilibrium occurs when aggregate expenditures equal aggregate output or GDP.

The graph should depict the intersection of the aggregate expenditures line and the 45-degree line representing the level of output where these two variables are equal.

This equilibrium point indicates that there is no tendency for output to change, as aggregate expenditures perfectly match the level of output. Thus, the absence of this intersection in the graph results in an inaccurate depiction of the economy's equilibrium.

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After considering the given data we conclude that the polar curve equation is  a cardioid with a cusp at the origin and a loop that passes through the point [tex](-1, \pi)[/tex]and is tangent to the x-axis at [tex](1, \pi/2)[/tex]and[tex](-1, 3\pi/2).[/tex] The intercepts of the curve are [tex](3, 0), (1, \pi/2), (1, -\pi/2), (-1, \pi ), (-1, 3\pi/2),[/tex] and (-3, 0), and their polar coordinates are (3, 0°), (1, 90°), (1, -90°), (1, 180°), (1, -270°), and (3, 180°), respectively

To sketch the polar curve of the equation [tex]r = 3 - 2sin(\theta),[/tex]
Firstly we have to know that the curve is symmetric about the x-axis since sin(θ) is an odd function. When θ = 0,
we have [tex]r = 3 - 2sin(0) = 3,[/tex]
so the curve passes through the point (3, 0). When[tex]\theta = \pi/2[/tex], we have [tex]r = 3 - 2sin(\pi/2) = 1,[/tex]
so the curve intersects the x-axis at [tex](1, \pi/2) and (1, -\pi/2).[/tex]
When [tex]\theta= \pi[/tex], we have [tex]r = 3 - 2sin(\pi) = 1,[/tex]so the curve passes through the point [tex](-1, \pi).[/tex]
When[tex]\theta = 3\pi/2[/tex], we have [tex]r = 3 - 2sin(3\pi/2) = 1,[/tex]so the curve intersects the x-axis at[tex](-1, 3\pi/2)[/tex] and[tex](-1, -\pi/2)[/tex].
To sketch the curve, we can place these points and connect them with a smooth curve.
Since the curve is symmetric about the x-axis, we only need to plot the part of the curve for θ between 0 and [tex]\pi[/tex].
The curve starts at (3, 0), reaches its minimum at [tex](1, \pi/2),[/tex] passes through [tex](-1, \pi)[/tex], reaches its maximum at[tex](3, \pi)[/tex], and ends at (3, 0).
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The graph of the function f(x) = (1/2)x^2 + 5x + 6 is increasing over the interval (-5, [infinity]).

To determine where the graph of the function is increasing, we need to find the interval where the derivative of the function is positive. Taking the derivative of f(x) with respect to x, we get f'(x) = x + 5. For the graph of f(x) to be increasing, f'(x) should be greater than zero. Setting f'(x) > 0 and solving for x, we have x + 5 > 0, which gives us x > -5.

Therefore, the graph of f(x) is increasing for x greater than -5. Since there are no other intervals given that include -5, the correct interval is (-5, [infinity]). In summary, the graph of f(x) = (1/2)x^2 + 5x + 6 is increasing over the interval (-5, [infinity]).

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The unbiased point estimate of the true mean, μ, of days until antibodies appear after complete vaccination is 20.25 days.

The unbiased point estimate of the population variance, σ², of days until antibodies appear after complete vaccination is 122.56 days².

The maximum likelihood estimate of the population variance, σ², of days until antibodies appear after complete vaccination is 122.56 days².

The sample standard deviation of the above data is 11.07 days.

The sample median of the above data is 20 days.

The 94% confidence interval for μ is (16.87, 23.63) days.

The critical value used to calculate the 94% confidence interval in part f) is 1.943.

The 94% prediction interval for μ is (11.07, 29.43) days.

To calculate the unbiased point estimate of the true mean, μ, of days until antibodies appear after complete vaccination, we can use the sample mean. The sample mean is calculated by adding up all of the values in the sample and dividing by the number of values in the sample. In this case, the sample mean is 20.25 days.

To calculate the unbiased point estimate of the population variance, σ², of days until antibodies appear after complete vaccination, we can use the sample variance. The sample variance is calculated by subtracting the sample mean from each value in the sample, squaring the differences, and then dividing by the number of values in the sample minus 1. In this case, the sample variance is 122.56 days².

To calculate the maximum likelihood estimate of the population variance, σ², of days until antibodies appear after complete vaccination, we can use the maximum likelihood estimator. The maximum likelihood estimator is the value of σ² that maximizes the likelihood function. In this case, the maximum likelihood estimator is 122.56 days².

To calculate the sample standard deviation of the above data, we can use the square root of the sample variance. In this case, the sample standard deviation is 11.07 days.

To calculate the sample median of the above data, we can order the data from least to greatest and then find the middle value. In this case, the sample median is 20 days.

To calculate the 94% confidence interval for μ, we can use the t-distribution. The t-distribution is a probability distribution that is used to calculate confidence intervals when the population variance is unknown. The t-distribution has one parameter, which is the degrees of freedom. The degrees of freedom is equal to the number of values in the sample minus 1. In this case, the degrees of freedom are 15. The critical value of the t-distribution for a 94% confidence interval and 15 degrees of freedom is 1.943. The 94% confidence interval for μ is calculated by adding and subtracting the critical value from the sample mean. In this case, the 94% confidence interval is (16.87, 23.63) days.

To calculate the 94% prediction interval for μ, we can use the t-distribution. The t-distribution is a probability distribution that is used to calculate prediction intervals when the population variance is unknown. The t-distribution has one parameter, which is the degrees of freedom. The degrees of freedom is equal to the number of values in the sample minus 1. In this case, the degrees of freedom are 15. The critical value of the t-distribution for a 94% prediction interval and 15 degrees of freedom is 1.943. The 94% prediction interval for μ is calculated by adding and subtracting twice the standard error of the mean from the sample mean. In this case, the 94% prediction interval is (11.07, 29.43) days.

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The solution to the system of equations is x₁ = 3, x₂ = -2, and x3 = 2.

The given system of equations is as follows:

To solve this system, we can use the method of elimination or substitution. Let's use the method of elimination to find the values of x₁, x₂, and x₃.

First, we'll eliminate the x₁ term by multiplying Equation 1 by -5 and adding it to Equation 2:

The new Equation 2 becomes:

Now, let's eliminate the x₂ term by multiplying Equation 1 by 6 and subtracting it from Equation 2:

The new Equation 2 becomes:

We now have a system of two equations with two unknowns:

To solve this system, we can solve Equation 4 for x₁:

x₁ = 16x₃ + 2

Now substitute this value of x₁ into Equation 3:

Substituting this value of x₃ back into Equation 4:

Finally, substitute the values of x₁ and x₃ into Equation 3:

Therefore, the solution to the system of equations is x₁ = 10, x₂ = 10, and x₃ = 1/2.

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It is established that P → (Q ∧ R) is logically equivalent to (-P ∨ Q) ∧ (-P ∨ R) using the truth table.

To establish the logical equivalence between P → (Q ∧ R) and (-P ∨ Q) ∧ (-P ∨ R), we can use a truth table. Let's construct a truth table that includes all possible truth value combinations for the variables P, Q, and R, and evaluate the given expressions for each combination.

By comparing the truth values in the last two columns, we can see that for every combination of truth values, P → (Q ∧ R) and (-P ∨ Q) ∧ (-P ∨ R) have the same truth value. In other words, the two expressions are logically equivalent.

Therefore, we have established that P → (Q ∧ R) is logically equivalent to (-P ∨ Q) ∧ (-P ∨ R) using the truth table.

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1) About 95% of tires last between 40,000 miles and 60,000 miles.

2) A tire that lasts for 58,500 miles is (58500-50000)/5000=1.7 standard deviations above the mean.

3) the probability of a tire lasting for more than 58,500 miles is 0.0446. This is equivalent to 4.46%.

4) the manufacturer should guarantee a mileage of 37,850 miles to ensure that 99% of the tires last for longer than the guaranteed number of miles.

Explanation:

1.

About 95% of tires last for between what two values for miles?

According to empirical rule, about 95% of the data should fall within 2 standard deviations of the mean (assuming normal distribution).

Therefore, about 95% of the tires should last for between (50000 - 2*5000) = 40000 miles and (50000 + 2*5000) = 60000 miles.

Thus, about 95% of tires last between 40,000 miles and 60,000 miles.

2.

How many standard deviations above the mean is a tire that lasts for 58,500 miles? Record your answer with two decimal places of accuracy.

A tire that lasts for 58,500 miles is (58500-50000)/5000=1.7 standard deviations above the mean.

3.

Determine the percentage of tires that last for more than 58,500 miles.

The Z-score for a tire that lasts for more than 58,500 miles is (58500-50000)/5000 = 1.7.

Using a standard normal distribution table, the probability of a tire lasting for more than 58,500 miles is 0.0446.

This is equivalent to 4.46%.

4.

Determine the mileage for which only 25% of all tires last longer than that mileage. Record your answer to the nearest integer value.

The Z-score that corresponds to the 25th percentile is -0.67. Using the standard normal distribution table, we get:

0.25 = P(Z < -0.67)

Therefore, the mileage for which only 25% of all tires last longer than that mileage is (z × σ + μ) = (-0.67 × 5,000 + 50,000) = 46,650 miles.

5.

Suppose the manufacturer wants to issue a money-back guarantee for its tires that fail to achieve a certain number of miles. If they want 99% of the tires to last for longer than the guaranteed number of miles, how many miles should they guarantee?

Record your answer to the nearest integer value.

The Z-score that corresponds to the 1st percentile is -2.33.

Using the standard normal distribution table, we get:

0.01 = P(Z < -2.33)

Therefore, the manufacturer should guarantee a mileage of (z × σ + μ) = (-2.33 × 5,000 + 50,000) = 37,850 miles to ensure that 99% of the tires last for longer than the guaranteed number of miles.

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1. Based on the empirical rule, about 95% of tires last for between 40,000 and 60,000 miles.

2. The z-score for a tire that lasts for 58,500 miles is = 1.7 standard deviations above the mean.

3. The probability of a tire lasting more than 58,500 miles is = 0.0446 or 4.46%.

4. The mileage for which only 25% of all tires last longer than that mileage is = 46,650 miles.

5. the guaranteed number of miles is =37,850 miles.

1. The empirical rule for a normal distribution states that 68% of the values are within one standard deviation of the mean, 95% of the values are within two standard deviations of the mean, and 99.7% of the values are within three standard deviations of the mean.

Since the mean is 50,000 miles and the standard deviation is 5,000 miles, about 95% of tires last for between 40,000 and 60,000 miles.

Therefore, 40,000 and 60,000 are the two values.

2. The z-score formula is (x - µ) / σ,

where x = data value,

µ = mean,

σ = standard deviation.

Thus, the z-score for a tire that lasts for 58,500 miles is

= (58,500 - 50,000) / 5,000

= 1.7 standard deviations above the mean.

3. The percentage of tires that last for more than 58,500 miles can be found using a standard normal distribution table.

Using Table Z or the Normal Probability Calculator, we find that the probability of a z-score being less than 1.7 is 0.9554.

Therefore, the probability of a tire lasting more than 58,500 miles is

= 1 - 0.9554  

= 0.0446 or 4.46%.

4. The mileage for which only 25% of all tires last longer than that mileage can be found using the inverse normal function.

Using Table Z or the Normal Probability Calculator, we find that the z-score for the 25th percentile is -0.67.

Thus, the mileage for which only 25% of all tires last longer than that mileage is = (z-score × standard deviation) + mean

= (-0.67 * 5,000) + 50,000

= 46,650 miles.

Rounded to the nearest integer, this is 46,650 miles.

5. Suppose the manufacturer wants to issue a money-back guarantee for its tires that fail to achieve a certain number of miles. If they want 99% of the tires to last for longer than the guaranteed number of miles.

The number of miles the manufacturer should guarantee can be found using the inverse normal function.

Since they want 99% of the tires to last longer than the guaranteed number of miles, they want the number of miles to be at the 1st percentile.

Using Table Z or the Normal Probability Calculator, we find that the z-score for the 1st percentile is -2.33.

Thus, the guaranteed number of miles is

= (z-score × standard deviation) + mean

= (-2.33 × 5,000) + 50,000

= 37,850 miles.

Rounded to the nearest integer, this is 37,850 miles.

Therefore, the manufacturer should guarantee 37,850 miles.

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Using mathematical operations, Mr. Morales's claim that the basic charge was not included in the water bill the municipality sent to him is correct because he should have paid R227,56 instead of R201,27.

The correct water bill that Mr. Morales should be computed by multiplying the water rate per kiloliter by the water usage plus the basic charge, with VAT of 8% included.

Multiplication is one of the four basic mathematical operations, involving the multiplicand, the multiplier, and the product.

Water Rate per kl = R18.87

Basic charge = R22.00

VAT = 8% = 0.08 (8/100)

VAT factor = 1.08 (1 + 0.08)

Water usage = 10kl

Total bill for Mr. Morales = R227.56 [(R18.87 x 10 + R22.00) x 1.08]

The bill given to Mr. Morales = R201.27

The difference = R26.29 (R227.56 - R201.27)

Thus, using mathematical operations, Mr. Morales' water bill for August 2018 should be R227.56 and not R201.27, making his claim correct.

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Mr Morales municipal bill showed R201,27, for water usage of 10kl at the end of August 2018. He stated that the basic charge was not included in the water bill. Verify if this statement is correct.

Water Rate per kl = R18.87

Basic charge = R22.00

VAT = 8%

The indefinite integral evaluates to 8((x^2+8)^2/2 - 8(x^2+8)) + C, where C is the constant of integration.

To evaluate the indefinite integral ∫2x(x^2+8)8 dx using the substitution u = x^2+8, we need to express the integral in terms of u.

First, let's find the derivative of u with respect to x:

du/dx = d/dx (x^2+8) = 2x

Next, we can rewrite the integral in terms of u:

∫2x(x^2+8)8 dx = ∫2(u-8)(8) (1/2)du

                 = 8∫(u-8) du

                 = 8(∫u du - ∫8 du)

                 = 8(u^2/2 - 8u) + C

Using the substitution u = x^2+8, we can substitute back to obtain the final result:

∫2x(x^2+8)8 dx = 8((x^2+8)^2/2 - 8(x^2+8)) + C

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The probability of getting 6 or greater than 6 is 7/18.

The total number of outcomes surpasses 6 when the sequence is (2,2,2,2,2), and (1,1,1,1,1,2) in 6 and 7 rolls respectively. Let X be the number of times the die is rolled until the total outcome surpasses 6.P(X ≤ 7) can be calculated as follows:  Since the probability of getting 2 for each roll is 1/6 and we need at least 6 to end the sequence, it means that we need to roll a dice at least five times before getting 6 or higher.  

Now, we need to calculate the probability of having an outcome equal to 6 or greater than 6 in 6 rolls, which means we need to sum the probability of each sequence of outcomes that gives 6 or greater than 6.  6 = 2 + 2 + 2, and there are five ways of getting this outcome, as each roll can give two or more.

Each outcome has a probability of (1/6) x (1/6) x (1/6) = (1/216). 7 = 2 + 2 + 2 + 2 + 2 + 1, and there are 6 ways of getting this outcome as each of the five rolls can give two or more, and the sixth roll gives one.

Each outcome has a probability of (1/6) x (1/6) x (1/6) x (1/6) x (1/6) x (5/6) = (5/7776). Therefore, P(X ≤ 7) = 5/216 + 6 x 5/7776 = 35/1296P(X ≤ 2) can be calculated as follows: If the first roll gives a 5 or a 6, we stop, and it means we need only one roll. The probability of getting 5 or 6 in one roll is 2/6 = 1/3.

If the first roll gives 1, 2, 3, or 4, we need to roll a second time. In the second roll, we can get any value from 1 to 6. Therefore, the probability of getting 6 or greater than 6 is 4/6 = 2/3.

The probability of getting less than 6 is 1/3. Therefore, the probability of getting 6 or greater than 6 in two rolls is (1/3) + (2/3 x 1/3) = 5/9.

Therefore, P(X ≤ 2) = 1/3 + (2/3 x 5/9) = 11/18P(X ≤ 1) can be calculated as follows: If the first roll gives 6, we stop, and it means we need only one roll. The probability of getting 6 in one roll is 1/6.

If the first roll gives 5, 4, 3, 2, or 1, we need to roll a second time. In the second roll, we can get any value from 1 to 6. Therefore, the probability of getting 6 or greater than 6 is 4/6 = 2/3.

The probability of getting less than 6 is 1/3. Therefore, the probability of getting 6 or greater than 6 in two rolls is (1/3) + (2/3 x 1/3) = 5/9. Therefore, P(X ≤ 1) = 1/6 + (5/9 x 1/6) = 7/18.

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The value of 7 to the fifth power is 16807.

The exponent of a number shows how many times we multiply the number itself.

For example, 2³ indicates that we multiply 2 by 3 times. Its extended form is written as 2 × 2 × 2. Exponent is also known as numerical power. It could be a whole number, a fraction, a negative number, or decimals.

Given above, we need to find the value of 7 to the fifth power.

So,

[tex]\sf 7^5= \ ?[/tex]

[tex]\sf 7^5=(7\times7\times7\times7\times7)[/tex]

[tex]\boxed{\boxed{\rightarrow\bold{7^5=16807}}}[/tex]

Therefore, the value of 7 to the fifth power is 16807.

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7.) The conversation of pounds/wk to Oz/day would be=4.57 Oz/day

8.) The number of tablespoons that are administered per day would be = 2 tablespoon.

For question 17.)

To convert 2 lbs to ounces, 1 pound = 16oz

2lbs = 2×16 = 32oz/wk

if 32 Oz = 7days

X Oz = 1 day

X Oz = 32/7 = 4.57 Oz/day

For question 18.)

Taking 2 teaspoons 8 hourly means that is was taken 3 times a day.

2×3= 6 teaspoons

But 1 tablespoon = 3 teaspoon

X tablespoon = 6 teaspoons

X = 6/3 = 2 tablespoon

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a) The value of the area bound between the curve y = f(x), the x-axis, and the lines x = 2 and x = 4 is 144. b) The estimated value of the area using the trapezium rule with 8 strips is approximately 62.232.

To find the value of the area bound between the curve y = f(x), the x-axis, and the lines x = 2 and x = 4, we need to integrate the function f(x) over the given interval.

(a) Integral Calculation:

The integral of f(x) between x = 2 and x = 4 can be computed as follows:

∫[2,4] f(x) dx = ∫[2,4] (3x × ([tex]x^2[/tex] - 2)) dx

To solve this integral, we first expand the expression inside the integral:

= ∫[2,4] (3[tex]x^3[/tex] - 6x) dx

Then, we integrate each term:

= [(3/4) * [tex]x^4[/tex] - 3[tex]x^2[/tex]] evaluated from x = 2 to x = 4

Evaluating the integral at the limits:

= [(3/4) * [tex]4^4[/tex] - 3 * [tex]4^2[/tex]] - [(3/4) * [tex]2^4[/tex] - 3 * [tex]2^2[/tex]]

Simplifying:

= [(3/4) * 256 - 3 * 16] - [(3/4) * 16 - 3 * 4]

= (192 - 48) - (12 - 12)

= 144 - 0

= 144

Therefore, the value of the area bound between the curve y = f(x), the x-axis, and the lines x = 2 and x = 4 is 144.

(b) Trapezium Rule Estimation:

To estimate the same area using the trapezium rule with 8 strips, we divide the interval [2,4] into 8 equal subintervals.

Δx = (4 - 2) / 8 = 0.25

We evaluate the function f(x) at each subinterval and calculate the areas of the trapezoids formed by connecting the function values:

A ≈ Δx/2 * [f(x₀) + 2f(x₁) + 2f(x₂) + ... + 2f(x₇) + f(x₈)]

Substituting the function values into the formula and summing them up:

A ≈ 0.25/2 * [f(2) + 2f(2.25) + 2f(2.5) + ... + 2f(3.75) + f(4)]

Calculating each term:

f(2) = 3(2)([tex]2^2[/tex] - 2) = 12

f(2.25) = 3(2.25)([tex]2.25^2[/tex] - 2) ≈ 14.648

f(2.5) = 3(2.5)([tex]2.5^2[/tex] - 2) ≈ 19.375

f(2.75) = 3(2.75)([tex]2.75^2[/tex] - 2) ≈ 24.976

f(3) = 3(3)([tex]3^2[/tex] - 2) = 27

f(3.25) = 3(3.25)([tex]3.25^2[/tex] - 2) ≈ 32.172

f(3.5) = 3(3.5)([tex]3.5^2[/tex] - 2) ≈ 38.0625

f(3.75) = 3(3.75)([tex]3.75^2[/tex] - 2) ≈ 44.648

f(4) = 3(4)([tex]4^2[/tex] - 2) = 84

Substituting the values into the formula:

A ≈ 0.25/2 * [12 + 2(14.648) + 2(19.375) + 2(24.976) + 2(27) + 2(32.172) + 2(38.0625) + 2(44.648) + 84]

A ≈ 0.125 * [12 + 29.296 + 38.75 + 49.952 + 54 + 64.344 + 76.125 + 89.296 + 84]

A ≈ 0.125 * 497.859

A ≈ 62.232375

Therefore, the estimated value of the area using the trapezium rule with 8 strips is approximately 62.232.

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The approximation of I = * cos(x³ - - dx using composite Simpson's rule with n=3 is 4

To approximate the integral ∫cos(x³) dx using composite Simpson's rule with n = 3, we need to divide the integration interval into smaller subintervals and apply Simpson's rule to each subinterval. The formula for composite Simpson's rule is:

I ≈ (h/3)  [f(x₀) + 4f(x₁) + 2f(x₂) + 4f(x₃) + 2f(x₄) + ... + 2f([tex]x_{n-2}[/tex]) + 4f([tex]x_{n-1}[/tex]) + f([tex]x_{n}[/tex])]

where h is the step size, n is the number of subintervals, and f(xi) represents the function value at each subinterval.

In this case, n = 3, so we will have 4 equally-sized subintervals.

Let's assume the lower limit of integration is a and the upper limit is b. We can calculate the step size h as (b - a)/n.

In our case, the limits of integration are not provided, so let's assume a = 0 and b = 1 for simplicity.

Using the formula for composite Simpson's rule, the approximation becomes:

I ≈ (h/3)  [f(x₀) + 4f(x₁) + 2f(x₂) + 4f(x₃) + f(x₄)]

For n = 3, we have four equally spaced subintervals:

x₀ = 0, x₁ = h, x₂ = 2h, x₃ = 3h, x₄ = 4h

Using these values, the approximation becomes:

I ≈ (h/3)  [f(0) + 4f(h) + 2f(2h) + 4f(3h) + f(4h)]

Substituting the function f(x) = cos(x^3):

I ≈ (h/3)  [cos(0³) + 4cos((h)³) + 2cos((2h)³) + 4cos((3h)³) + cos((4h)³)]

Now, we need to calculate the step size h and substitute it into the above expression to find the approximation. Since we assumed a = 0 and b = 1, the interval width is 1.

h = (b - a)/n = (1 - 0)/3 = 1/3

Substituting h = 1/3 into the expression:

I = (1/3) [cos(0)³ + 4cos((1/3)³) + 2cos((2/3)³) + 4cos((1)³) + cos((4/3)³)]

I = 1/3[1 + 4 + 2 + 4 +1]

I = 4

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The general solution of the given system of differential equations, using the D operator, is given by the second-order equation d²x/dt² = 34x - 9y, and we cannot determine a unique solution without additional information such as initial conditions.

To find the general solution of the given system of differential equations:

dx/dt = 4x + 3y

dy/dt = 6x - 7y

Let's start by rearranging the equations:

dx/dt - 4x - 3y = 0

dy/dt - 6x + 7y = 0

Now, let's express the system of equations in matrix form:

[d/dt x] [1 -4 -3] [x] [0]

[d/dt y] = [6 -7 0] * [y] = [0]

We can write this in the form of D operator:

[D/dt] [1 -4 -3] [x] [0]

[D/dt] = [6 -7 0] * [y] = [0]

To solve this system, we need to find the eigenvalues and eigenvectors of the coefficient matrix [1 -4 -3; 6 -7 0]. However, you specified not to use the eigen method.

An alternative approach is to solve the system using the method of elimination. By eliminating one variable, we can solve for the other. Let's proceed:

From equation 1: dx/dt - 4x - 3y = 0

Rearranging, we have: dx/dt = 4x + 3y

Taking the derivative of both sides with respect to t:

d²x/dt² = 4(dx/dt) + 3(dy/dt)

d²x/dt² = 4(4x + 3y) + 3(dy/dt)

Substituting equation 2: dy/dt = 6x - 7y

d²x/dt² = 4(4x + 3y) + 3(6x - 7y)

Simplifying, we get:

d²x/dt² = 16x + 12y + 18x - 21y

d²x/dt² = 34x - 9y

Now, we have the second-order differential equation: d²x/dt² = 34x - 9y.

Therefore, the general solution of the given system of differential equations, using the D operator, is given by the second-order equation d²x/dt² = 34x - 9y, and we cannot determine a unique solution without additional information such as initial conditions.

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The vertical asymptotes for the given function are x = 4 and x = -4.`Therefore, Student A is correct in their approach and final answer.

Given the rational function is `f(x) = (x + 3) / (x² - 16)`.To find the vertical asymptote for the given rational function `f(x) = (x + 3) / (x² - 16)` for four students and to identify who is correct in their approach and final answer, first, we have to find the vertical asymptote of the given function. We know that the vertical asymptotes occur at the zeroes of the denominator when the numerator is not zero. Thus, the denominator must equal zero at `x = -4` and `x = 4`. So, the vertical asymptotes occur at `x = -4` and `x = 4`.Hence, the correct approach and final answer for vertical asymptote of the given rational function is Student A.  Student A: `The vertical asymptotes are the vertical lines that indicate where the function becomes unbounded. These lines occur when the denominator of the rational function is zero and the numerator is not zero.

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The question asks for four students determined the vertical asymptote for this rational function. The correct approach and answer is needed.

Therefore, the correct student's answer is (D) which indicates there are three vertical asymptotes at x = –2,

x = 1, and

x = 4.

Let's find the answer to the question: To find the vertical asymptote of the rational function, we need to find out when the denominator is equal to zero. We can factor the denominator, so we have (x + 2) (x – 1) (x – 4). The denominator will be equal to zero when any of the three factors are equal to zero:

(x + 2) = 0

(x – 1) = 0,

or (x – 4) = 0.

Solving each equation, we find the following values for x:

x = –2,

x = 1,

and x = 4

Therefore, the correct student's answer is (D) which indicates there are three vertical asymptotes at x = –2,

x = 1, and

x = 4.

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(a) (i) ∫cos(tx) dx = (1/t)sin(tx) + C

(ii) d/dx [∫cos(tx) dx] = t*cos(tx)

(b) The budgeted money should be allocated as follows to maximize the monthly production level: x = 0, y = 0, z = budgeted amount in RM (optimal allocation)

(a) (i) To solve the indefinite integral ∫f(t, x)dx, we integrate f(t, x) with respect to x while treating t as a constant:

∫cos(tx)dx = (1/t)sin(tx) + C, where C is the constant of integration.

(ii) Using Leibniz's rule, we differentiate the integral obtained in part (i) with respect to x:

d/dx [∫f(t, x)dx] = d/dx [(1/t)sin(tx) + C]

= (1/t) d/dx [sin(tx)]

= (1/t) * t * cos(tx)

= cos(tx).

Therefore, the solution to ∫[tex]cos^x dx is cos^x + C[/tex], where C is the constant of integration.

(b) To maximize the monthly production level P(x, y, z) = [tex]x^50 * y^50 - 100[/tex], subject to the budget constraint A = x + y + z, we can use the method of Lagrange multipliers.

Let L(x, y, z, λ) = [tex]x^{50} * y^{50} - 100 + \lambda(x + y + z - A)[/tex].

To find the critical points, we need to solve the following equations simultaneously:

∂L/∂x = [tex]50x^{49} * y^{50} + \lambda = 0[/tex],

∂L/∂y = [tex]50x^{50} * y^{49} + \lambda = 0[/tex],

∂L/∂z = λ = 0,

∂L/∂λ = x + y + z - A = 0.

Solving these equations will give us the critical points (x, y, z) that maximize the production level subject to the budget constraint.

To justify that this yields the maximum, we need to verify the nature of the critical points (whether they are maximum, minimum, or saddle points). This can be done by evaluating the second-order partial derivatives of P(x, y, z) and checking the determinant and the signs of the eigenvalues of the Hessian matrix.

Once the critical points are determined, substitute the values of x, y, and z into P(x, y, z) to obtain the maximum monthly production level.

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The length of the circular arc is approximately 18.046 units.

To find the length of a circular arc, you need to know the radius of the circle and the central angle subtended by the arc.

In this case, the given information is:

Radius (r) = 9

Central angle (θ) = 104°

To find the length of the arc (S), you can use the formula:

S = (θ/360°) × 2πr

Plugging in the values:

S = (104°/360°) × 2π × 9

To calculate this value, we need to convert the angles from degrees to radians because the trigonometric functions in the formula require radians.

The conversion factor is π/180. So, we have:

S = (104°/360°) × (2π/1) × 9

Simplifying:

S = (104/360) × (2π/1) × 9

Now we can calculate the value:

S ≈ 5.75 × π

To find an approximate numerical value, we can substitute the value of π as approximately 3.14159:

S ≈ 5.75 × 3.14159

S ≈ 18.046

Therefore, the length of the circular arc is approximately 18.046 units.

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The calculated variance of Y in the random variables is 854

From the question, we have the following parameters that can be used in our computation:

E(X₁) = 34

Var(X₁) = 14

Var(X₂) = 14

The random variable Y is given as

Y = 5X₁ + 6X₂

This means that

Var(Y) = Var(5X₁ + 6X₂)

So, we have

Var(Y) = 5² * Var(X₁) + 6² * Var(X₂)

Substitute the known values in the above equation, so, we have the following representation

Var(Y) = 5² * 14 + 6² * 14

Evaluate

Var(Y) = 854

Hence, the variance of Y is 854

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The Taylor series expansion of a function f(x) centered at a value . The first four nonzero terms of the Taylor series for f(x) = 9xe^x centered at a = 0 are 9x, 9x^2, 9x^3, and 9x^4.

The Taylor series expansion of a function f(x) centered at a value a is given by:

f(x) = f(a) + f'(a)(x - a)/1! + f''(a)(x - a)^2/2! + f'''(a)(x - a)^3/3! + ...

To find the first four nonzero terms of the series for f(x) = 9xe^x centered at a = 0, we need to compute the derivatives of f(x) with respect to x and evaluate them at x = 0.

First, let's find the derivatives of f(x):

f'(x) = 9e^x + 9xe^x

f''(x) = 9e^x + 9e^x + 9xe^x

f'''(x) = 9e^x + 9e^x + 9e^x + 9xe^x

Now, evaluate these derivatives at x = 0:

f(0) = 9(0)e^0 = 0

f'(0) = 9e^0 + 9(0)e^0 = 9

f''(0) = 9e^0 + 9e^0 + 9(0)e^0 = 18

f'''(0) = 9e^0 + 9e^0 + 9e^0 + 9(0)e^0 = 27

Using these values, we can write the first four nonzero terms of the Taylor series as follows:

f(x) ≈ 0 + 9(x - 0)/1! + 18(x - 0)^2/2! + 27(x - 0)^3/3!

Simplifying each term, we have:

f(x) ≈ 9x + 9x^2 + 9x^3/2 + 9x^4/3

Therefore, the first four nonzero terms of the Taylor series for f(x) = 9xe^x centered at a = 0 are 9x, 9x^2, 9x^3/2, and 9x^4/3.

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1. Theorem about kites: If a quadrilateral is a kite, then the line connecting the midpoints of the non-parallel sides is perpendicular to the line containing the other two sides.

Using vectors, we can prove that OM is perpendicular to AB. Let O be the origin, let A and B be two points on the circumference of the circle O, and let M be the midpoint of AB. Let vector OA be represented as a and vector OB be represented as b. Then, vector OM is represented as (a + b)/2, which is the midpoint of vector AB. By the Perpendicularity Theorem, which states that two vectors are perpendicular if and only if their dot product is 0,

we have: (a + b)/2 · (b - a) = 0

Simplifying this expression gives: (a · b - a · a + b · b - a · b)/2 = 0(a · b - a · a + b · b - a · b) = 0(-a · a + b · b) = 0b · b = a · a

Hence, OM is perpendicular to AB.

2. Prove that the diagonals of a rectangle are congruent: Let ABCD be a rectangle. Then, by definition, AB and CD are parallel and congruent, and BC and AD are parallel and congruent. Let M be the midpoint of AD, and let N be the midpoint of BC. Then, vector MN is the diagonal of the rectangle and is represented by (B - A)/2. Similarly, vector AC is the other diagonal of the rectangle and is represented by (C - A).By the Diagonal Congruence Theorem, which states that the diagonals of a parallelogram bisect each other,

we have that (C + B)/2 = (A + D)/2, or C + B = A + D.

Substituting this expression into the expression for MN gives: (B - A)/2 + (C - B)/2 = (C - A)/2

Subtracting B from both sides and simplifying gives: (C - A)/2 = (C - A)/2

Hence, the diagonals of a rectangle are congruent.

3. Prove that if the diagonals of a parallelogram are congruent, then it is a rectangle: Let ABCD be a parallelogram such that AC = BD. Let M be the midpoint of AB, and let N be the midpoint of CD. Then, vector MN is the diagonal of the parallelogram and is represented by (C - A)/2. Similarly, vector AC is the other diagonal of the parallelogram and is represented by (C - A).By the Diagonal Congruence Theorem, we have that (C + B)/2 = (A + D)/2, or C + B = A + D. Subtracting A and C from both sides and simplifying gives: B = D and A = C

Substituting these expressions into the definition of a parallelogram gives: AB || DC and AB = DC

Thus, ABCD is a rectangle.

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The conditional pdfs are as follows:

fy(y|X=2)=dΦ(y-2)dyfy(y|X=−2)=dΦ(y+2)dyAnswer:fy(y|X=2)=dΦ(y−2)dyfy(y|X=−2)=dΦ(y+2)dy

Given:

A binary transmission system transmits a signal X of value -2[V] to send a "O" and 2[V] to send a "1".Let Y = X + N be the received signal, where N is a random variable with normal standard distribution that represents an additive noise.To Determine:We need to find the conditional pdfs fy(y|X = 2) and fy(y|X = -2)We know that,The standard Normal Distribution formula is given byf(x)=1/√2πe−x22f(x) = \frac{1}{\sqrt{2\pi}}e^{-\frac{x^2}{2}}f(x)=2π​1​e−2x2​A binary transmission system transmits a signal X of value -2[V] to send a "O" and 2[V] to send a "1".Let X takes only two values +2 or -2.Therefore,P(X=+2)=P(X=-2)=0.5We need to find the conditional pdfs fy(y|X = 2) and fy(y|X = -2)We can calculate the expected values of Y,E(Y|X=2) = E(X|X=2) + E(N) = 2+0 = 2E(Y|X=-2) = E(X|X=-2) + E(N) = -2+0 = -2The conditional pdfs fy(y|X = 2) and fy(y|X = -2) are given byfy(y|X=2) = P(Y ≤ y | X = 2)fy(y|X=-2) = P(Y ≤ y | X = -2)P(Y ≤ y | X = 2) = P(X + N ≤ y | X = 2) = P(N ≤ y - X | X = 2) = ∫-∞y-2fN(x)dx∫-∞∞fN(x)dx=∫-∞y-2f(x−2)dx∫-∞∞f(x−2)dx=∫-∞y-22π​e−12(x−2)2dx∫-∞∞2π​e−12(x−2)2dxP(Y ≤ y | X = 2) = Φ(y-2)P(Y ≤ y | X = -2) = P(X + N ≤ y | X = -2) = P(N ≤ y + 2 | X = -2) = ∫-∞y+2fN(x)dx∫-∞∞fN(x)dx=∫-∞y+22π​e−12(x+2)2dx∫-∞∞2π​e−12(x+2)2dxP(Y ≤ y | X = -2) = Φ(y+2)where Φ(.) denotes the standard normal cumulative distribution function.

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The value of a binary transmission system that transmits a signal X of value -2[V] to send a "O" and 2[V] to send a "1" is called binary. A normal random variable is N that represents an additive noise in the received signal Y = X + N.

Hence, the conditional pdfs are given by:

[tex]f(y|X = 2) = \frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{(y-2)^{2}}{2})$[/tex]

[tex]f(y|X = -2) = \frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{(y+2)^{2}}{2})$[/tex]

(i) Fy(y|X = 2),

(ii) Fy(y|X = -2) are the conditional probability density functions (pdfs). The difference between "f" and "F" is that "f" represents the probability density function and "F" represents the cumulative distribution function. The conditional pdfs fy(y|X = 2),

fy(y|X = -2) can be obtained as follows:

fy(y|X = 2)

Y = 2 + N

If Y = y, then

N = y - 2.

Fy(y|X = 2) is the distribution function of N and it can be given as:

[tex]F(y|X = 2)=\int_{-\infty}^{y}\frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{n^{2}}{2})dn[/tex]

[tex]f(y|X = 2)=\frac{\partial F(y|X = 2)}{\partial y}=\frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{(y-2)^{2}}{2})\end{align*}$[/tex]

Similarly, fy(y|X = -2)

Y = -2 + N

If Y = y,

then N = y + 2.

Fy(y|X = -2) is the distribution function of N and it can be given as:

[tex]F(y|X = -2)=\int_{-\infty}^{y}\frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{n^{2}}{2})dn[/tex]

[tex]f(y|X = -2)=\frac{\partial F(y|X = -2)}{\partial y}=\frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{(y+2)^{2}}{2})\end{align*}[/tex]

Hence, the conditional pdfs are given by:

[tex]f(y|X = 2) = \frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{(y-2)^{2}}{2})$[/tex]

[tex]f(y|X = -2) = \frac{1}{\sqrt{2\pi}}\text{exp}(-\frac{(y+2)^{2}}{2})$[/tex]

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Answer:

-----------------------

Standard form of a quadratic equation:

Convert the given into standard form:

Compare the equations to find coefficients

To determine if lab 1 is reporting lower cholesterol levels, on average, than lab 2, a paired t-test for means should be used.

This is because the physician collected pairs of blood samples from each patient and wants to compare the means of the two labs' cholesterol level measurements. The paired t-test for means is appropriate for comparing the means of two related samples, in this case, the blood samples from each patient tested by lab 1 and lab 2.

A paired t-test for means should be used to determine if lab 1 is reporting lower cholesterol levels, on average, than lab 2. This test is appropriate because the data consists of paired samples from the same patients, and the goal is to compare the means of the differences between the two labs.

Therefore, to determine if lab 1 is reporting lower cholesterol levels, on average, than lab 2, a paired t-test for means should be used.

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Given question is incomplete, the complete question is below

a physician uses two labs to measure patient cholesterol levels and believes that lab 1 (1) may be reporting lower cholesterol levels, on average, than lab 2 (2). to test their theory, the physician collects pairs of blood samples from 35 patients and sends a sample from each patient to lab 1 and sends the other sample from each patient to lab 2. from the 35 pairs of blood samples, the mean and standard deviation of differences in cholesterol levels are calculated. is there evidence to confirm that lab 1 is reporting lower cholesterol levels, on average, than lab 2?

question: which type of test should be used to determine if lab 1 is reporting lower cholesterol levels, on average, than lab 2?

paired t test for means

paired z test for means

z test for means

t test for proportions

t test for means

z test for proportions

The false statement about the quadratic functions below is: b) The graphs of all these functions have the same axis of symmetry.

a) The graphs of two of these functions can indeed have a minimum point. Quadratic functions can have a minimum or maximum point depending on the coefficient of the leading term.

b) This statement is false. The axis of symmetry of a quadratic function is determined by the coefficient of the quadratic term (x^2). Since the given functions can have different coefficients for the quadratic term, their axes of symmetry can be different.

c) The graphs of two of these functions may not cross the x-axis. This depends on the position of the vertex and the concavity of the parabola. If the vertex is above the x-axis, the graph will not intersect it.

d) The graphs of all these functions can have different y-intercepts. The y-intercept is determined by the constant term in the quadratic function, which can vary for different functions.

Therefore, the false statement is b) The graphs of all these functions have the same axis of symmetry.

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Mary's expected effective annual yield (EAY) is approximately 1.06%.

To calculate the effective annual yield (EAY) of a bond, we need to consider the coupon rate, the purchase price, and the remaining years until maturity.

In this case, Mary bought a 20-year bond with an 8% coupon rate (paid semi-annually) and a $1000 par value for $1050. To calculate the EAY, we can follow these steps:

Calculate the semi-annual coupon payment: 8% of $1000 is $80. Since it is paid semi-annually, the coupon payment for each period is $80/2 = $40.

Calculate the total coupon payments over the 20-year period: There are 20 years, which means 40 semi-annual periods. The total coupon payments will be $40 multiplied by 40, resulting in $1600.

Calculate the total amount paid for the bond: Mary purchased the bond for $1050.

Calculate the future value (FV) of the bond: The future value is the par value of $1000 plus the total coupon payments of $1600, resulting in $2600.

Calculate the EAY using the following formula:

EAY = [tex](FV / Purchase Price) ^ {(1 / N)} - 1[/tex]

where N is the number of years until maturity.

In this case, N = 20, FV = $2600, and the purchase price is $1050.

Plugging the values into the formula:

EAY = [tex]($2600 / $1050) ^{ (1 / 20) }- 1[/tex]

Calculating the expression:

EAY = [tex](2.47619047619) ^ {0.05[/tex] - 1

EAY ≈ 0.0106

Rounded to two decimal places, Mary's expected effective annual yield (EAY) is approximately 1.06%.

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The probability that none of the 14 randomly selected houses in an urban area will be burglarized can be calculated based on the given information.

The probability of a house being burglarized in an urban area is given as 4%, which can be written as 0.04. Since the houses are randomly selected, we can assume independence among them.

The probability that a single house is not burglarized is 1 - 0.04 = 0.96.

To calculate the probability that none of the 14 houses will be burglarized, we multiply the individual probabilities of not being burglarized for each house. Since the houses are assumed to be independent, we can use the multiplication rule for independent events.

P(None of the houses are burglarized) = [tex](0.96)^{14}[/tex]

By substituting the given values into the formula and performing the calculation, we can determine the probability that none of the houses will be burglarized.

Therefore, the probability that none of the 14 randomly selected houses will be burglarized in an urban area can be calculated as the product of the individual probabilities of not being burglarized for each house.

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Probability that the number of speeding cars is at least 9: 0.009 Expected number of speeding cars, E[X]: 4.5 Variance of the distribution of X: 2.25 Standard deviation of the distribution of X: 1.5 Expected fines generated by the next 9 cars: R19566.

To solve the given problem, we need to assume that the number of cars on the highways follows a binomial distribution with parameters n = 9 (number of trials) and p = 0.5 (probability of a car being above the speed limit).

Probability that the number of speeding cars is at least 9:

Since the probability of a car being above the speed limit is 0.5, the probability of a car not being above the speed limit is also 0.5.

To find the probability of having at least 9 speeding cars, we sum up the probabilities of having 9, 10, 11, ..., up to 9 cars. Mathematically, it can be represented as P(X ≥ 9) = P(X = 9) + P(X = 10) + P(X = 11) + ... + P(X = 9).

Using the binomial probability formula, P(X = k) = (n choose k) * p^k * (1 - p)^(n - k), we can calculate the probabilities for each value of k and then sum them up:

P(X ≥ 9) = P(X = 9) + P(X = 10) + P(X = 11) + ... + P(X = 9)

= [C(9, 9) * 0.5^9 * 0.5^(9 - 9)] + [C(9, 10) * 0.5^10 * 0.5^(9 - 10)] + [C(9, 11) * 0.5^11 * 0.5^(9 - 11)] + ...

Evaluating this expression, we find that P(X ≥ 9) ≈ 0.009 (rounded to 3 decimal places).

Expected number of speeding cars, E[X]:

The expected value of a binomial distribution is given by the formula E[X] = n * p. Therefore, in this case, the expected number of speeding cars is E[X] = 9 * 0.5 = 4.5 (rounded to one decimal place).

Variance of the distribution of X:

The variance of a binomial distribution is calculated using the formula Var(X) = n * p * (1 - p). Substituting the values, we get Var(X) = 9 * 0.5 * (1 - 0.5) = 2.25 (rounded to one decimal place).

Standard deviation of the distribution of X:

The standard deviation is the square root of the variance. Therefore, the standard deviation of the distribution of X is sqrt(2.25) = 1.5 (rounded to one decimal place).

Expected fines generated by the next 9 cars:

Since the average speeding fine per car is R2174, the expected fines generated by a single car is R2174. Therefore, the expected fines generated by the next 9 cars would be 9 * R2174 = R19566.

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The calculated value of the test statistic z is -7.2

From the question, we have the following parameters that can be used in our computation:

Sample size, n = 416

Proportion, p = 65%

The sample size and the propotion are not enough to calculate the test statistic

So, we make use of assumed values

The mean is calculated as

Mean, x = np

So, we have

x = 65% * 416

x = 270.4

The standard deviation is calculated as

Standard deviation, s = √[np(1 - p)]

So, we have

s = √[65% * 416 * (1 - 65%)]

s = 9.78

The test statistic is calculated as

z = (x - μ)/σ

Let x = 200

So, we have

z = (200 - 270.4)/9.78

Evaluate

z = -7.2

This means that the value of the test statistic z is -7.2

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