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.


Determine the average time a customer waits in line.

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