Question: 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

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 1.5 minutes and the arrival rate is 72 customers every hour, using the Queuing.xlsx calculator tool, find, when two service windows are open,

a.	the probability both windows are idle.
b.	the average number of customers waiting in line.
c.	the average time a customer is in the post office.

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