4) Repair calls are handled by one repairman at a photocopy shop. Repair time, including travel time, is exponentially distributed, with a mean of two hours per call. Requests for copier repairs come in at a mean rate of three per eight- hour day (assume Poisson). Determine: 1. The average number of customers awaiting repairs. 2. System utilization. 3. The amount of time during an eight-hour day that the repairman is not out on a call. 4. The probability of two or more customers in the system.

Practical Management Science
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ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
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 4) Repair calls are handled by one repairman at a photocopy shop. Repair time, including travel time, is exponentially distributed, with a mean of two hours per call. Requests for copier repairs come in at a mean rate of three per eight- hour day (assume Poisson). Determine:
1. The average number of customers awaiting repairs.
2. System utilization.
3. The amount of time during an eight-hour day that the repairman is not out on a call.
4. The probability of two or more customers in the system.

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