Determine the optimum preventive maintenance frequency for each of the pieces of equipment if breakdown time is normally distributed: (Round "Probability Ratio" to 4 decimal places, and all other answers to 2 decimal places. Negative values should be indicated by a minus sign.) Use Table.

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Determine the optimum preventive maintenance frequency for each of the pieces of equipment if breakdown time is normally
distributed: (Round "Probability Ratio" to 4 decimal places, and all other answers to 2 decimal places. Negative values should be
indicated by a minus sign.)
Use Table.
Equipment.
A201
B400
C850
Equipment
A201
B400
CB50
Equipment
Average Time (days)
between Breakdowns
A201
B400
C850
20
30
45
Preventive
Maintenance Cost
Click here for the Excel Data File:
$330
$230
$580
Probability Ratio
Standard
Deviation
3
Breakdown
Cont
$2,230
$3,530
$4,825
Interval (days)
Transcribed Image Text:Determine the optimum preventive maintenance frequency for each of the pieces of equipment if breakdown time is normally distributed: (Round "Probability Ratio" to 4 decimal places, and all other answers to 2 decimal places. Negative values should be indicated by a minus sign.) Use Table. Equipment. A201 B400 C850 Equipment A201 B400 CB50 Equipment Average Time (days) between Breakdowns A201 B400 C850 20 30 45 Preventive Maintenance Cost Click here for the Excel Data File: $330 $230 $580 Probability Ratio Standard Deviation 3 Breakdown Cont $2,230 $3,530 $4,825 Interval (days)
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