Consider a bank with two tellers. An average of 80 customers per hour arrive at the bank and wait in a single line for an idle teller. The average time it takes to serve a customer is 1.2 minutes. Assume that interarrival times and service times are exponential. Determine 1 The expected number of customers present in the bank 2 The expected length of time a customer spends in the bank 3 The fraction of time that a particular teller is idle