Determine the optimum preventative maintenance


Question: Determine the optimum preventative maintenance frequency for each of the pieces of equipment if breakdown time is normally distributed.

Equipment Average Time (days) Standard Deviation between Breakdowns

A201    20    2
B400    30    3
C850    40    4

Equipment    Preventative Maintenance Cost    Breakdown Cost
A201    $300    $2300
B400    $200    $3500
C850    $530    $4800

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Other Management: Determine the optimum preventative maintenance
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