Barber college is the best deal in town! for only $5, you can get a shampoo and cut by any one of four untrained stylists completed in 7.5 minutes on average. perhaps this is why customers show up on average two minutes apart (both interarrival times and service times are exponentially distributed). management is concerned about the waiting time for customers and decides to train one more student. if the arrival and service rates remain the same as in the original scenario, what happens to the number of customers in the system?