Question: You are given an M/M/1 queueing system in which the expected waiting time and expected number in the system are 120 minutes and 8 customers,

You are given an M/M/1 queueing system in which the expected waiting time and expected number in the system are 120 minutes and 8 customers, respectively. What is the probability that a customers service time exceeds 20 minutes?

a. 0.167

b. 0.26

c. 0.47

d. 0.53

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