Q 20. Cars arrive at a service station according to Poisson’s distribution with a mean
rate of 5 per hour. The service time per car is exponential with a mean of 10
minutes. At steady state, the average waiting time in the queue is
(A) 10 minutes
(B) 20 minutes
(C) 25 minutes
(D) 50 minutes
Answer: (D)
Explanation:
