3. MP Nails Salon is run by two nail artists, Makayla Mani and Penny Pedi, each capable of serving 4 customers per hour, on average. Six customers, on average, arrive at the salon each hour.

a. If all arriving customers wait in a common line for the next available stylist, how long would a customer wait in line, on average, before being served? b. Suppose that 50 percent of the arriving customers want to be served only by Makayla and that the other 50 percent want only Penny. How long would a customer wait in line, on average, before being served by Makayla? By Penny? (Think about how you would model the line structure here. How has the system, and therefore the formulas, changed?) c. Do you observe a difference in the answers to parts a) and b)? If so, why do you think it is so?