A Bank Is Designing a New Branch Office and Needs

Multiple Choice

A bank is designing a new branch office and needs to determine how much driveway space to allow for cars waiting for drive up teller service.The drive up service will have three tellers and a single waiting line.At another branch of the bank in a similar setting,the average service time for drive up tellers is 4 minutes per customer and average arrival rate is 36 customers per hour.It is expected that the new bank will have similar characteristics. How many spaces should be provided to have a 96% probability of accommodating all of the waiting cars?

A) 10
B) 12
C) 14
D) 16
E) 18