Customers can’t get enough of Ricardo’s Ice Cream Store. They arrive at an average rate of 11 per hour during the workday. It takes the store employee about 3.5 minutes to serve a customer. The arrival pattern is approximately Poisson distributed.
a. What is the average number of customers in the system?
b. What is the average number of customers waiting to be helped by the employee?
c. What is the average time that a customer is in the system?
d. What is the probability that there are 4 customers in the system?