Question: suppose that the average time before breakdown is normally distributed with a mean of 2.5 weeks and a standard deviation of 0.4 weeks. if breakdowns

suppose that the average time before breakdown is normally distributed with a mean of 2.5 weeks and a standard deviation of 0.4 weeks. if breakdowns cost an average of $1,200 and preventive maintenance costs $800, what is the optimal maintenance interval? (select the nearest number) [recommended time: < 15 minutes] select one: a. 2.08 weeks b. 2.83 weeks c. 2.40 weeks d. 2.29 weeks e. 2.95 weeks f. 1.83 weeks

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