(Answered) 1a sandwich shop near campus has a special counter open

Statistics

1.A sandwich shop near campus has a special counter, open from 11 to 1pm, which is used exclusively for selling pre-made sandwiches. The clerk can handle a customer in about one minute. Customers arrive at the rate of 40 per hour on average. How long in minutes does a customer have to wait?

What is the average number of customers waiting in line?

What is the probability of there being two or more customers in the system?

Comments: find T1, N1, and 1-(Po+P1)

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