A sandwich shop near campus has a special counter, open from 11 am to 1 pm, which is used exclusively for selling pre-made sandwiches.This is much faster than making sandwiches to order at lunch time.The clerk can handle a customer in about one minute.Customers arrive at a rate of 40 per hour on average.
a.How long (in minutes) does a customer have to wait?
b.What percentage of the time is the employee working?
c.What is the average number of customers waiting in line?
d.What is the probability of there being 3 or more customers in the system?

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The Answer of A sandwich shop near campus has a special counter, open from 11 am to 1 pm, which is used exclusively for selling pre-made sandwiches.This is much faster than making sandwiches to order at lunch time.The clerk can handle a customer in about one minute.Customers arrive at a rate of 40 per hour on average.
a.How long (in minutes) does a customer have to wait?
b.What percentage of the time is the employee working?
c.What is the average number of customers waiting in line?
d.What is the probability of there being 3 or more customers in the system?

A Sandwich Shop near Campus Has a Special Counter, Open