What is the average number of customers waiting in line for service?, statistics homework help

  

A post office has a single line for customers to use while 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 distribution, while the service time follows an exponential distribution. The average arrival rate is three per minute and the average service rate is 4 per minute for each of the two clerks. What is the average number of customers waiting in line for service?A.0.6430B.0.1227C.0.7500D.1.6333E.none of these

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