A Jiffy Lube franchise manager is concerned about the amount of time it takes for his technicians to

A Jiffy Lube franchise manager is concerned about the amount
of time it takes for his technicians to change the oil and filters of cars. The
current mean time for the complete operation is 18 minutes. He hasnt kept
track of the number of times his employees took more than 30 minutes to
complete a car but he knows that the probability is too high. There are several
ways to reduce the mean time. Determine the mean time necessary to reduce the
probability that a job takes longer than 30minutes to 10%.

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