Benny the Barber owns a one-chair shop. At barber college, they told Benny that his customers would exhibit a Poisson arrival distribution and that he would provide an exponential service distribution. Benny the Barber is considering the addition of a second chair. Customers would be selected for a haircut on a FCFS basis from those waiting. Benny has assumed that both barbers would take an average of 6 minutes to give a haircut, and that business would remain unchanged with customers arriving at a rate of ten per hour. Use Exhibit_7.12. a. What is the average number of customers waiting. (Round your answer to 4 decimal places.) Average number of customers b. What is the average time a customer waits in line? (Round your answer to 2 decimal places.) Average waiting time minutes c. What is the average time a customer is in the shop. (Do not round intermediate calculations. Round your answer to 2 decimal places.) Average time minutes