16 19. You are contemplating going to Subs-R-Us for lunch, and check their reviews to find that the average amount of time it takes to get in and leave with a sub is 5 minutes. If customers arrive at the store at the rate of 12 per hour, what is the probability that there are less than 3 customers in the store? Assume an M/M/1 system. Your answer should be a probability p, o sps1