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The repair time for air conditioning units is believed to have a normal distribution with a mean of 38 minutes. a. What is the standard deviation of repair time if 40% of the units are repaired between 33 and 43 minutes? b. Using the value of the standard deviation that you calculated in a., what is the probability that a repair will be longer than an hour? c. Using the value of the standard deviation that you calculated in a., what is the probability that the repair time for an air conditioning unit will be less than 25 minutes?

The repair time for air conditioning units is believed to have a normal distribution with a mean of 38 minutes. a. What is the standard deviation of repair time if 40% of the units are repaired between 33 and 43 minutes? b. Using the value of the standard deviation that you calculated in a., what is the probability that a repair will be longer than an hour? c. Using the value of the standard deviation that you calculated in a., what is the probability that the repair time for an air conditioning unit will be less than 25 minutes?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Please show the steps to solve the problems 28 a, b, and c.
The repair time for air conditioning units is believed to have a normal distribution with a mean of 38 minutes. a. What is the standard deviation of repair time if 40% of the units are repaired between 33 and 43 minutes? b. Using the value of the standard deviation that you calculated in a., what is the probability that a repair will be longer than an hour? c. Using the value of the standard deviation that you calculated in a., what is the probability that the repair time for an air conditioning unit will be less than 25 minutes?
Transcribed Image Text:The repair time for air conditioning units is believed to have a normal distribution with a mean of 38 minutes. a. What is the standard deviation of repair time if 40% of the units are repaired between 33 and 43 minutes? b. Using the value of the standard deviation that you calculated in a., what is the probability that a repair will be longer than an hour? c. Using the value of the standard deviation that you calculated in a., what is the probability that the repair time for an air conditioning unit will be less than 25 minutes?
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