Question 2 10 pts When customers have a problem with their electric service, they go to the Salisbury Electric Company and talk to a service representative. During the day, the company only has one sales representative on duty and that representative takes an average of 15 minutes to handle a customer concern. On a typical day, on average 3 customers arrive per hour. What is the probability that at least 2 customers will be waiting in line? Answer: Since there is one service representative, one person in the waiting line means persons in the company (system). Therefore, the probability that at least 2 customers in the waiting line = the probability that at least customers in the system. Now, let P(x) as the probability that exactly x persons in the system. Then, the the probability that at least customers in the system = 1-(PC ) +PC )+PC )) -- (as P(0) + P(1)+ P(2) + P(3) + P(4) + = 1) = 0. 19