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3 years ago

Need help! Find the area of the shaded region in the figure.

Mathematics

1 answer:

guapka [62]3 years ago

5 0

Answer:

2.4584

Step-by-step explanation:

it's the same question as the other one

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A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

Lubov Fominskaja [6]

Answer:

The required sample size for the new study is 801.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

What is the required sample size for the new study?

This is n for which M = 0.03. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.96\sqrt{\frac{0.25*0.75)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.25*0.75}$

$\sqrt{n} = \frac{1.96\sqrt{0.25*0.75}}{0.03}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{0.25*0.75}}{0.03})^2$

$n = 800.3$

Rounding up:

The required sample size for the new study is 801.

4 0

3 years ago

Seven hotdogs and four hamburgers cost $13. Four hotdogs and seven hamburgers cost $14.50. How much does one hamburger cost and

viva [34]

Answer:

hotogs=$1.50 hamburgers=$1

Step-by-step explanation:

h=hotdog b=hamburger

7h+4b=13

4h+7b=14.5

(7h+4b=13)-4b

4h+7b=14.5

h=-0.57b+1.86

4h+7b=14.5

8 0

3 years ago

What is the equation of the line that passes through the point (8,-3) and has an undefined slope?

BARSIC [14]

Answer:

x = 8

Step-by-step explanation:

A line with "undefined" slope is a vertical line, whose equation is of the form ...

x = constant

In order for the line to go through a point with an x-coordinate of 8, the constant must be 8.

x = 8 . . . . . a vertical line through (8, -3)

8 0

3 years ago

A soccer game lasts 90 minutes without running into overtime. The coach

KatRina [158]

Answer: 7 Switches will be made.

Step-by-step explanation:

$\frac{90}{12.5}=$ number of switches

$7.2=$ number of switches

however you cannot have a fraction of a switch so you must round it to a whole number, which in this case is 7.

5 0

2 years ago

Josiah and his children went into a grocery store and he bought $15 worth of peaches and mangos. Each peach costs $0.50 and each

Westkost [7]

Step•BY•Step Explanation~|

 ♡♡♡♡♡♡♡♡♡♡♡♡♡ 

y=1.50

x=0.50

1.50

1.59

______+

3.00

0.50

_____+

3.50

<h2>Answer:♡~</h2>

3.50

HOPE IT HELPSS

8 0

2 years ago

Need help! Find the area of the shaded region in the figure. ​

Need help! Find the area of the shaded region in the figure.