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The post office uses a multiple channel queue, where customers wait in a single line for the first available window.

The post office uses a multiple channel queue, where customers wait in a single line for the first available window.  If the average service time is 1 minute and the arrival rate is 7 customers every five minutes, find, when two service windows are open, (Use Management Scientist, Make sure that l and m are in the same units).
a. the probability both windows are idle.
b. the probability a customer will have to wait.
c. the average time a customer is in line.
d. the average time a customer is in the post office.

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