Question: A lawn mower repair service employs one repairperson, who takes an average of one hour to service a lawn mower. A mower is brought in for service on the average of one every 90 minutes. Assume that arrival and service rates can be described by Poisson distributions. Determine the following:

1. The average number of mowers awaiting service.
2. The average time a mower waits for service.
3. The probability that the number waiting for service will exceed 4 mowers.
4. The probability that the repairperson will be without a mower to service.

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