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Determine the optimum preventive maintenance frequency for each of the pieces of equipment if breakdown time is normally distributed: Clearly label your calculations and describe using course related principles in 200 words.


Avg Time (days)between breakdowns

Standard Deviation



Preventive Maintenance Cost

Breakdown Cost

A201 20 2   A201 $300 $2300
B400 30 3   B400 $200 $3500
C850 40 4   C850 $530 $4800
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