LO D.2 Customers enter the waiting line at a cafeterias only cash register on a first-come, first-served

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LO D.2 Customers enter the waiting line at a cafeteria’s only cash register on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution. If the average number of arrivals is 6 per minute and the average service rate of a single server is 10 per minute, what is the average number of customers in the system?

a) 0.6

b) 0.9

c) 1.5

d) 0.25

e) 1.0

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