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Margaret [11]
3 years ago
15

In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fu

el pump in a car. How large a sample must he select if he wants to be 90% confident that the average time is within 20 minutes of the sample average? Assume the standard deviation of all times is 40 minutes.
Mathematics
1 answer:
Ede4ka [16]3 years ago
4 0

Answer:

ME = 1.96(45)/sqrt(n) 25 = 1.96(45)/sqrt(n) n = (1.96(45)/25)^2 = 6

Step-by-step explanation:

yw

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In a parallelogram if AB = 3x + 2y and AB = 30 what is the value of x and y
Sergeeva-Olga [200]
We can put the two equations together with substitution, and we get

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5 consecutive house numbers in a
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1. Find the value of x in the diagram below. <br> a) 8 <br> b) 10 <br> c) 12 <br> d) 16
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Step-by-step explanation:

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3 years ago
Emil is itemizing deductions on his federal income tax return and had $1900 in non-reimbursed work expenses last year. If his AG
a_sh-v [17]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Below are the choices that can be found from other source:

A.$340 
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<span>C.$38 </span>
<span>D.$1862</span>

Below is the solution:

78000 x .0.02=1560 
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