Question

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

A. 3.8 weeks

B. 8.4 weeks

C. 9.6 weeks

D. 6.9 weeks

E. 7.2 weeks

Answer

This answer is hidden. It contains 171 characters.