Question: A bank has six tellers. Mean service time equals one minute. Mean interarrival time equals 25 seconds. Standard deviation of service times equals one minute.

A bank has six tellers.

Mean service time equals one minute.
Mean interarrival time equals 25 seconds.
Standard deviation of service times equals one minute.
Standard deviation of interarrival times equals 10 seconds.

Would you recommend adding more tellers?

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