Question: The average time before breakdown of a machine toormally distributed and has a mean of 18 weeks and a standard deviation of three weeks. If

The average time before breakdown of a machine toormally distributed and has a mean of 18 weeks and a standard deviation of three weeks. If breakdown cost averages $2.000 and preventive maintenance costs $1,400, what is the optimal preventive maintenance interval? Multiple Choice 14 213 weeks 16.9 weeks 146 weeks 14.6 weeks 16.4 weeks 19.6 weeks

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