Question: A post office has a single line for customers waiting for the next available postal clerk. There are two postal clerks who work at the

A post office has a single line for customers waiting for the next available postal clerk. There are two postal clerks who work at the same rate. The arrival rate of customers follows a Poisson process, while the service time follows an exponential distribution. The average arrival rate is 5 per hour and the average service rate is 13 per hour for each of the two clerks. What proportion of time are both clerks idle?

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