Customers at a bank wait in a single in for the next available teller. Customer arrivals can be modeled by a Poisson distribution that has a mean of 70 per hour during the midmorning hours. A teller can process an average of 100 customers per hour, which also can be modeled by a Poisson distribution. If there are two tellers on duty determine: a. the average time a customer must wait in line b. the average number of customers waiting in line c. average service time d. system utilization e. the probability of no customers waiting in line