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3 years ago

What is the mean? 69 71 85 96 93 78 89

Mathematics

1 answer:

nadezda [96]3 years ago

3 0

Answer:

Step-by-step explanation:

Mean is the average

so add all the numbers up and divide it by how many numbers you have

(69+71+85+96+93+78+89)/ 7=83

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In a study of government financial aid for college students, it becomes necessary to estimate the percentage of full-time coll

algol13

Answer:

(a) The sample size required is 2401.

(b) The sample size required is 2377.

Step-by-step explanation:

The confidence interval for population proportion <em>p</em> is:

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

The margin of error in this interval is:

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

The information provided is:

MOE = 0.02

$z_{\alpha/2}=z_{0.05/2}=z_{0.025}=1.96$

(a)

Assume that the proportion value is 0.50.

Compute the value of <em>n</em> as follows:

$MOE=z_{\alpha/2}\sqrt{\frac{\hat p(1-\hat p)}{n}}\\0.02=1.96\times \sqrt{\frac{0.50(1-0.50)}{n}}\\n=\frac{1.96^{2}\times0.50(1-0.50)}{0.02^{2}}\\=2401$

Thus, the sample size required is 2401.

(b)

Given that the proportion value is 0.55.

Compute the value of <em>n</em> as follows:

$MOE=z_{\alpha/2}\sqrt{\frac{\hat p(1-\hat p)}{n}}\\0.02=1.96\times \sqrt{\frac{0.55(1-0.55)}{n}}\\n=\frac{1.96^{2}\times0.55(1-0.55)}{0.02^{2}}\\=2376.99\\\approx2377$

Thus, the sample size required is 2377.

(c)

On increasing the proportion value the sample size decreased.

8 0

4 years ago

1180:21 pleas help

katen-ka-za [31]

If you want the ratio in its simplest form, then it’s already in its simplest form.

8 0

4 years ago

Plsss help It due tmr plsss

geniusboy [140]

Answer: 50

Step-by-step explanation:

exterior angles are supplement of interior angle therefore the 110 thing must be 70, also youre given 60 so 70+60=130

50 is missing from 180

6 0

3 years ago

What is the area of an equilateral triangle that has a side length of 10 inches?

WINSTONCH [101]

I think it might be 43.3in^2

4 0

3 years ago

A lamppost, CAB, bent at point A after a storm. The tip of the lamppost touched the ground at point C, as shown below:

Elina [12.6K]

Applying the tangent ratio, the height, in feet, of the lamppost is calculated as: D. 10(tan50°)

<h3>What is the Tangent Ratio?</h3>

Tangent ratio, is, tan ∅ = opposite side / adjacent side of the right triangle.

Given the following:

∅ = 50°

Opposite side = AB (height) = ?

Adjacent side = 10 feet

Apply the tangent ratio:

tan 50 = AB/10

AB = 10(tan50°)

Learn more about the tangent ratio on:

brainly.com/question/4326804

#SPJ2

5 0

3 years ago

Read 2 more answers