Question: The Department of Industrial Engineering of a university has one Xerox machine. Users of this machine arrive at the rate of one every 20 ± 2 minutes and use it for 15 ± 10 minutes. If the machine is busy, 90% of the users wait and finish the job, while the I 0% of the users come back after 10 minutes. Assume that they do not balk again. Simulate for 500 customers and find out the probability that a balking customer need not wait during the second attempt.