Mekong Bank has one Automated Teller Machine (ATM), placed outside the bank. It takes the machine an average of 4 minutes (exponentially distributed) to serve a bank customer. Customers arrive at the drive-up window at the rate of 12 per-hour (Poisson distributed). Determine the probability of no customers in the queuing system. Determine average number of customers in the queuing system. Determine average time a customer spends waiting in line. i. ii. iii. iv. The bank manager is considering adding another two Automated Teller Machines (ATM). Would this have a significant impact on waiting time in line. I