Question: Formula: preventive cost / preventive cost + breakdown cost mean + z (standard deviation) = ?? Thanks A grocery chain has 50 refrigerated trailers. Each

Formula:

preventive cost / preventive cost + breakdown cost

mean + z (standard deviation) = ??

Thanks

Formula: preventive cost / preventive cost +

A grocery chain has 50 refrigerated trailers. Each trailer is used for approximately 2,500 hours per year. A critical part of the refrigerator is a belt that fails after an average of 575 hours with standard deviation of 175 hours (time between failures is Normally distributed). If the belt is replaced during a scheduled maintenance, the cost is $85, whereas an unscheduled replacement costs $285. What is the optimal scheduled replacement interval? LO2

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