| Stephanie Robbins is the Three Hills Power Company management analysts assigned to simulate maintenance costs. In Section 13.6 we describe the simulation |
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| of 15 generator breakdowns and the repair times required when one repairperson is on duty per shift. The total simulated maintenance cost of the current system is $4,320. |
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| Robbins would now like to examine the relative cost-effectiveness of adding one more worker per shift. Each new repairperson would be paid $30 per hour, the same |
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| rate as the first paid. The cost per breakdown hour is still $75. Robbins makes one vital assumption as she begins – one half the times required with only one repairperson on duty per shift. |
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| Table 13.13 can then be restated as follows: |
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| REPAIR TIME REQUIRED (HOURS) |
PROBABILITY | Randon Number Table | |||||||||||||||||
| 0.5 | 0.28 | Second from the Bottom Row | Last Row | ||||||||||||||||
| 1 | 0.52 | 69 | 37 | ||||||||||||||||
| 1.5 | 0.2 | 84 | 77 | ||||||||||||||||
| 1.00 | 12 | 13 | |||||||||||||||||
| 94 | 10 | ||||||||||||||||||
| 51 | 2 | ||||||||||||||||||
| a. Simulate this proposed maintenance system change over a 15-generator breakdown period. Select the randon numbers neededfor time between breakdowns from the |
36 | 18 | |||||||||||||||||
| second from the bottom row of Table 13.4 (beginning with the digits 69). Select randon numbers for generator repair times from the last row of the table (beginning with 37). |
17 | 31 | |||||||||||||||||
| 2 | 19 | ||||||||||||||||||
| b. Should Three Hills add a second repairperson each shift? |
15 | 32 | |||||||||||||||||
| 29 | 85 | ||||||||||||||||||
| 16 | 31 | ||||||||||||||||||
| 52 | 94 | ||||||||||||||||||
| 56 | 81 | ||||||||||||||||||
| 43 | 43 | ||||||||||||||||||
| 26 | 31 | ||||||||||||||||||
| 22 | 58 | ||||||||||||||||||
| 8 | 33 | ||||||||||||||||||
| 62 | 51 | ||||||||||||||||||
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