Last National bank is concerned about the level of service at its single drive-in window. A study if customer arrivals during the windows busy period revealed that on an average, 20 customers arrive every hour, following a Poisson distribution. The customers are given a FCFS service which requires an average of 2 minutes and follows a Poison distribution. Based on the information above, determine,
a. Mean arrival rate
b. Mean service rate
c. Average number of customers waiting in the queue