Robert Olney's Barbershop is a popular haircutting and styling salon near the campus of the University of New Haven. Four barbers work full-time and spend an average of 12 minutes on each customer. Customers arrive all day long at an average rate of 17 per hour. Arrivals tend to follow a Poisson distribution, and service times are exponentially distributed. The average rate of pay for the barbers is $20 per hour. Customer wait time is calculated at $25 per hour. The shop is open 8 hours a day. Based on this information, answer the following: a. What is the average number of customers in the barber shop? b. What is the average time spent in the shop? c. What is the average time that a customer waits to be called to the barber chair? d. Based on considering waiting cost, what is the total daily cost