Jerry's barbershop can hold a maximum of 2 people, and any potential customer who finds a shop full will not wait for a harcut Jerry charges $21 per haircut and takes an average of 20 minutes to complete a haircut. On average, six potential customers arrive per hour at the barbershop. Of course, a potential customer becomes an actual customer only if he or she finds that the shop is not full. Assuming that inter-arrival and haircut times are exponentially distributed. a. What is the probability that is three customers in Jerry's barbershop? (4 pts) a. What is the entering rate of Jerry's barbershop per hour? (10 pts) b. What is Jerry's revenue per hour? ( 4 pts)