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3 years ago

PLS HELP WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS WITHIN 4 AND AN HALF MINUTES

Mathematics

1 answer:

hjlf3 years ago

7 0

the answer would be 356.40 dollars

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An advertising agency that serves a major radio station wants to estimate the mean amount of time the station’s audience members

Flura [38]

Answer:

$n=(\frac{1.645(45)}{5})^2 =219.18 \approx 220$

So the answer for this case would be n=220 rounded up to the nearest integer

Step-by-step explanation:

Information given

$\sigma = 45$ represent the population deviation

$ME = 5$ represent the margin of error

The margin of error for the true mean is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =5 and we are interested in order to find the value of n, if we solve n from equation (4) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 90% of confidence interval now can be founded using the normal distribution. The significance level is $\alpha=1-0.9=0.1$ and the critical value would be $z_{\alpha/2}=1.645$ , replacing into formula (b) we got:

$n=(\frac{1.645(45)}{5})^2 =219.18 \approx 220$

So the answer for this case would be n=220 rounded up to the nearest integer

5 0

3 years ago

Read 2 more answers

Estimate the value of \frac{\sqrt{2\pi }}{\sqrt{5}}

Butoxors [25]

Answer:

the exact answer is 1.98

if we rationalize denominator we get root 0f 10 times pi divided by 5

root of 10 is about 3.1 ( $\pi$ ) so we have $\frac{\pi ^{2} }{5}$ ≈ 9.6/5 = 1.92

Step-by-step explanation:

$\frac{\sqrt{2\pi }}{\sqrt{5}} * \frac{\sqrt{5 }}{\sqrt{5}}$ = $\frac{\sqrt{10} \pi }{5}$

3 0

3 years ago

Find the equivalent exponential expression (7^2)^3

atroni [7]

Answer: 117649 is your answer

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3 years ago

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A line includes the points (-3, 8)and (-1, 2). What is its equation in slope- intercept form

Natasha_Volkova [10]

Solve for slope first:
m = $\frac{y2 - y1}{x2 - x1}$

m = $\frac{2-8}{-1-(-3)}$ = -3

then solve for b in y = mx + b

8 = -3(-3) + b
b = -1

y = -3x - 1

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3 years ago

Leonard earned $100 from a bonus plus $15 per day (d) at his job this week. Which of the following expressions best represents L

djyliett [7]

Answer:

...........

$⟼15d + 100$

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2 years ago