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Alik [6]
4 years ago
5

QUESTION 7

Mathematics
1 answer:
Whitepunk [10]4 years ago
5 0

Answer:

99% Confidence interval:  (0.0375,0.2099)                                  

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 97

Number of left handed, x = 12

\hat{p} = \dfrac{x}{n} = \dfrac{12}{97} = 0.1237

99% Confidence interval:

\hat{p}\pm z_{stat}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}

z_{critical}\text{ at}~\alpha_{0.01} = 2.58

Putting the values, we get:

0.1237\pm 2.58(\sqrt{\dfrac{0.1237(1-0.1237)}{97}}) = 0.1237\pm 0.0862\\\\=(0.0375,0.2099)

The required confidence interval is (0.0375,0.2099).                    

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It takes Jack Frost 5 minutes to fly 35 minutes with the wind. It takes him 7 minutes to go 35 minutes against the wind. Determi
dezoksy [38]

Answer:his speed in still air is 6 miles per minute.

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Step-by-step explanation:

Let x represent his speed in still air.

Let y represent the speed of the wind.

It takes Jack Frost 5 minutes to fly 35 miles with the wind. This means that his total speed would be x + y

Distance = speed × time

It means that

35 = 5(x + y)

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It takes him 7 minutes to go 35 miles against the wind. This means that his total speed would be x - y

It means that

35 = 7(x - y)

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5 0
4 years ago
Can someone help me with the areas?
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Answer:

for 1. it is 99 and for 3. it is 343.75

Step-by-step explanation:

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for 3. you have to add both bases (35+20) and multiply the height (55 x 12.5) to it and then divide it by 2 (687.5 / 2)

hope this helps! please heart <3

8 0
2 years ago
Read 2 more answers
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