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A multiple channel queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 4 customers per hour and

A multiple channel queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 4 customers per hour and an average service time of 18 minutes per customer. The minimum number of servers required to avoid an overloaded system is: 

A. 1

B. 2

C. 3

D. 4

E. 5n


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