3. Experience the Tour de France {ETFJ is a specialty travel agent. It arranges vacations for amateur cyclists who want to experience the Tour de France by riding through one or more stages in the race. It has four people who take calls from clients. Each call lasts on average 30 minutes, with a standard deviation of 60 minutes. A call arrives on average every 25 minutes with a standard deviation of 25 minutes. a. (5 points each) What is the coefficient of variation of arrival (Na and the coefficient of variation of the service time CV9? b. (15 points} On average, how many minutes does a caller wait before talking to an agent? c. (15 points) 0n Average how many cailers are waiting? 4. The organizers of a conference in the Houston Convention Center are evaluating the possibility of setting up a computer area where attendees can check their email on computers provided by the organization. There will be one common queue for all computers and only one person uses a computer at a time. On average, there are 17 attendee arrivals per hour and the average time a person spends on the computer is 12 minutes. To ensure that waiting times are not too long, the organizers want to ensure that the utilization of the computers doesn't exceed 90 percent. a. (10 points} At least how many computers do they need to have? b. (10 points} With 5 computers, how long will an attendee expect to wait for a computer? Assume all Oils are 1. c. (10 points) If they provide 5 computers (not necessarily the answer to Part a) how many attendees on average will be waiting for a computer? Assume all CV5 are 1