Question: For a mainframe computer, a preventive maintenance inspection and repair cycle costs a total of $2,000 on the average. If the computer breaks down, an

For a mainframe computer, a preventive maintenance inspection and repair cycle costs a total of $2,000 on the average. If the computer breaks down, an average cost of $5,000 is incurred. The historical breakdown pattern for the computer is the following:

Months between PM

Average number of breakdowns between PM

1

0.2

2

0.6

3

1.8

4

3.6

5

7.0

a) Recommend how often preventive maintenance should be performed.

b) For the above information, suppose that the average cost of a breakdown is unknown. What is the breakdown cost that would have the total cost of the 2-month PM cycle equal to the 3-month PM cycle?

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