A Bank has one counter to serve the customers who have complaints about their loans. An average of 96 customers arrives at the counter in an 8-hour day. The staff at the counter spend irregular amount of time to serve a customer who has a complaint but on average spends 4 minutes per customer. Required: a) The average number of customers in the system b) The average number of customers waiting to be served c) The average time a customer spends in the system d) The average queue waiting time e) The probability that a customer will be served immediately upon arrival f) The probability that the number of customers in the system is greater than four