QUESTIONS Two technicians (working separately) are responsible for the repair of 16 cellular phone towers whenever the towers fail to work. On average, it takes a y day for a technician to repair a tower. When a tower breaks down, if both technicians are busy then the first technician to become available will repair the tower. Each tower requires repair approximately once every six days. In order to provide sufficient customer service, at least 13 towers must be in running order. The probability that at least 13 towers will be in running order is_ %. a. 50% -60% b. 60% - 70% c. 70% - 80% d. 80% - 90% e. 90% - 100% QUESTION 10 With a single-server model, increasing the arrival rate by 10 percent and also increasing the service rate by 10 percent will result in: a. an increase in both the average number of customers in the system, and the average wait time. b. no change in either the average number of customers in the system, or the average wait time. c. a decrease in both the average number of customers in the system, and the average wait time. d. no change in the average number of customers in the system, but a decrease in the average wait time