Question
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
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?
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Probability And Statistics For Engineers And Scientists
Authors: Anthony Hayter
3rd Edition
495107573, 978-0495107576
