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Ad libitum [116K]

3 years ago

13

Ben bowled 139 and

2 answers:

VashaNatasha [74]3 years ago

8 0

First, add 139+184=323.
Then multiply 170 to 3 to get the total number of points he must get to achieve that average.
170 multiplied to 3 gives you 510.
Then subtract 500- (139+184)= 187. This is the number of points Ben must get in his third game to have an average of 170

QveST [7]3 years ago

3 0

Answer:

187

Step-by-step explanation:

Were gonna start by writing an equation (139+184+x)/3=170 because were adding a 3rd value to the average and x is going to be our value that were looking for. If you solve that, you get 187. Hope this helps.

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3 years ago

A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct a 99% c

Lana71 [14]

Answer:

The minimum sample size required to create the specified confidence interval is 2229.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

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Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What is the minimum sample size required to create the specified confidence interval

This is n when $M = 0.06, \sigma = 1.1$

$0.06 = 2.575*\frac{1.1}{\sqrt{n}}$

$0.06\sqrt{n} = 2.575*1.1$

$\sqrt{n} = \frac{2.575*1.1}{0.06}$

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Rounding up

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3 years ago

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6 0

3 years ago

Read 2 more answers

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