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QUESTION 40 Suppose that the average time before breakdown is normally distributed with a mean of 2.5 weeks and a standard deviation of .4 weeks. If breakdowns cost an average of $1,200 and preventive maintenance costs $800, what is the optimal maintenance interval? O Every 67 weeks O Every 33 weeks O Every 2.67 weeks O Every 3.25 weeks O Every 3.12 weeks Click Save and Submit to save and submit. Click Save All Answers to save all answers