I need some help on problem A and B! Thank You so Much!

Problem 11-03 (Algorithmic) Willow Brook National Bank operates a drive-up teller window that allows customers to complete bank transactions without getting out of their cars. On weekday mornings, arriva's to the drive-un teller window our at render, with an arrival rate of 20 customers per haur ar D.S customers per minute. In the same bank waiting line system, assume that the service times for the drive-up teller fallow an exponential probability distribution with a service rate of 26 customers per hour, or 0.6 customers per minute. Determine the following aperating characteristics for the system: a. The probability that no customers are in the system. If required, round your answer to four decimal places. Po - 0.1666 x b. The average number of customers waiting. If required, round your answer to four decimal places 4.1666 X C. The average number of customers in the system. If required, round your answer to nearest whole number. 5 d. The average time a customer spends waiting. If required, round your answer to four decimal places. W4 - 8.3333 min e. The average time a customer spends in the system. It required, round your answer to nearest whole number. W- 10 min F. The probability that arriving customers will have to wait for service. If required, round your answer to four dedmal places - 0.83337 Check My Work Pataly correct