Sharp Discounts Wholesale Club has two service desks, one at each entrance of the store. Customers arrive at each service desk at an average of one every six minutes. Sharp Discounts Wholesale Club is considering consolidating its two service desks into one location, staffed by two clerks. The clerks will continue to work at the same individual speed of four minutes per customer.
a. What is the probability of waiting in line?
b. How many customers on average, are waiting in line?
c. How much time does a customer spend at the service desk (waiting plus service time)?