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Author Question: A college dorm obtains a sample of its residents by randomly selecting 5 of the 20 floors and ... (Read 45 times)

WhattoUnderstand

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on: Aug 2, 2018
A college dorm obtains a sample of its residents by randomly selecting 5 of the 20 floors and interviewing all students living on those 5 floors.
 
  A) Yes B) No

Question 2

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours.
 
  If 40 mechanics are randomly selected, find the probability that their mean rebuild time exceeds 8.1 hours.
  A) 0.8457 B) 0.7285 C) 0.8531 D) 0.9146


miss.ashley

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Reply #1 on: Aug 2, 2018
Answer to Question 1

A

Answer to Question 2

C


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