PLZ HELP PLZ HELP The histogram below shows the homework grades from the last assignment in Mr. Smith's class.

Mathematics

1 answer:

KonstantinChe [14]3 years ago

4 0

Answer:

Median, Interquartile range

Step-by-step explanation:

I took the test.

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A sample of 1000 college students at NC State University were randomly selected for a survey. Among the survey participants, 102

cupoosta [38]

Answer:

The upper endpoint of the 99% confidence interval for population proportion is 0.13.

Step-by-step explanation:

The confidence interval for population proportion is:

$CI=\hat p\pm z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

Given:

n = 1000

$\hat p$ = 0.102

$z_{\alpha /2}=z_{0.01/2}=z_{0.005}=2.58$

*Use the standard normal table for the critical value.

Compute the 99% confidence interval for population proportion as follows:

$CI=\hat p\pm z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}\\=0.102\pm 2.58\times\sqrt{\frac{0.102(1-0.102)}{1000}}\\=0.102\pm0.0248\\=(0.0772, 0.1268)\\\approx (0.08, 0.13)$

Thus, the upper limit of the 99% confidence interval for population proportion is 0.13.

6 0

3 years ago

the sum of the distances two hikers walked is 53 miles, and the difference is 25 miles. what are the distances

mestny [16]

To solve this problem, you can create a system of equations and solve for each hiker's distance walked.

Hiker 1 distance walked: x
Hiker 2 distance walked: y

Their combined distance walked is 53 miles, thus -
x + y = 53

The difference between miles walked is 25, thus -
x - 25 = y

Let's solve using substitution. To do that, substitute x - 23 into x + y = 53 for y.

x + y = 53
x + (x - 25) = 53
x + x - 25 = 53
2x - 25 = 53
2x = 78
x = 39

To find y, substitute 39 for x into either of the equations.

x + y = 53
39 + y = 53
y = 14

Finally, check all work.

x + y = 53
39 + 14 = 53
53 = 53

x - 25 = y
39 - 25 = 14
14 = 14

Answer:
One hiker walked 39 miles and the other hiker walked 14 miles.

4 0

3 years ago

Is 27 a solution???

Shkiper50 [21]

Solution is 30 for the problem x-20=10

5 0

3 years ago

Which expression is equivalent to sec^2xcot^2x

Dimas [21]

Answer:

Step-by-step explanation:

Using the identities