Question: In a single-server queue, the inter-arrival time and the service time both have the exponential distribution. The mean inter-arrival time is 5 hours, while the

In a single-server queue, the inter-arrival time and the service time both have the exponential distribution. The mean inter-arrival time is 5 hours, while the mean service time is 4 hours. The mean time spent in the queue must be:

a. 4 hours

b. 2 hours

c. None of the other choices.

d. 16 hours

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