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 4 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 4 hours, while the mean service time is 2 hours. The mean time spent in the system must be

None of the other choices

4 hours

2 hours

5 hours

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