Question: A single server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 6 customers per hour and

A single server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 6 customers per hour and an average service rate of 9 customers per hour. What is the probability that this system will contain 4 or more customers?

a. 0.8025

b. 0.8683

c. 0.7037

d. 0.1975

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