ueuing. Juan Dela Cruz has just completed her MBA degree and is proud to have earned a promotion to Vice President for Customer Services at Citibank. One of his responsibilities is to manage how tellers provide services to customers, so he is taking a hard look at this area of the bank's operations. Customers needing teller service arrive randomly at a mean rate of 30 per hour. Customers wait in a single line and are served by the next available teller when they reach the front of the line. Each service takes a variable amount of time (assume an exponential distribution), but on average can be completed in 3 minutes. The tellers earn an average wage of $18 per hour. Question: If two tellers are used, (1) what will be the average waiting time for a customer before reaching a teller? On average, (2) how many customers will be in the bank, including those currently being served