Benny the barber (see question 1) 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 20 minutes to give a haircut, and that business would remain unchanged with customers arriving at a rate of two per hour. find the following information to benny decide if a second chair should be added: part (a): the average number of customers waiting.

part (b): the average time a customer waits.

part (c): the average time a customer is in the shop.