Question: The average time before breakdown of a machine is normally distributed and has a mean of nine weeks and a standard deviation of 1 .

The average time before breakdown of a machine is normally distributed and has a mean of nine weeks and a standard deviation of 1.5 weeks. If breakdown cost averages $1,500 and preventive maintenance costs $500, what is the optimal preventive maintenance interval?
The average time before breakdown of a machine is normally distributed

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