Question: 9. A single server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 9 customers per hour
9. A single server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 9 customers per hour and an average service rate of 15 customers per hour. What is the probability that this system will contain 2 or more customers?
a. 0.36
b.0.64
c. 0.4
d. 0.784
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