The time X that a technician requires to perform preventative maintenance on an air-conditioning unit has a

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The time X that a technician requires to perform preventative maintenance on an air-conditioning unit has a mean of 1 hour and a standard deviation of 1.

a) Your company operates 70 of these units. What does the probability (proportion of customers) have to wait 50 minutes or more?

b) Find the probability that the mean time spent working on 70 units is less than 1.1 hours?

Related Book For answer-question

Probability and Statistics for Engineers and Scientists

ISBN: 978-0495107576

3rd edition

Authors: Anthony Hayter

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Posted Date: May 25, 2018 01:10 AM

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