The average time before breakdown of a machine is normally 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?
A)16.4 weeks
B)14.6 weeks
C)16.9 weeks
D)19.6 weeks
E)21.3 weeks

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The Answer of The average time before breakdown of a machine is normally 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?
A)16.4 weeks
B)14.6 weeks
C)16.9 weeks
D)19.6 weeks
E)21.3 weeks

The Average Time Before Breakdown of a Machine Is Normally