Question

The length of time required for the periodic maintenance of an automobile or another machine usually...

The length of time required for the periodic maintenance of an automobile or another machine usually has a mound-shaped probability distribution. Because some occasional long service times will occur, the distribution tends to be skewed to the right. Suppose that the length of time required to run a 5,000-mile check and to service an automobile has mean 1.3 hours and standard deviation 0.9 hour. Suppose also that the service department plans to service 50 automobiles per 8-hour day and that, in order to do so, it can spend a maximum average service time of only 1.6 hours per automobile. On what proportion of all workdays will the service department have to work overtime? (Round your answer to four decimal places.)

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