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 Suppose it costs $20 per hour to have a teller working, and you value a customers time at $15 per hour How many tellers should you have working

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.

Suppose it costs $20 per hour to have a teller working, and you value a customer’s time at $15 per hour. How many tellers should you have working?

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