A Suburban Specialty Restaurant Has Developed a Single Drive-Thru Window

Multiple Choice

A suburban specialty restaurant has developed a single drive-thru window.Customers order,pay,and pick up their food at the same window.Arrivals follow a Poisson distribution,while service times follow an exponential distribution.If the average number of arrivals is 6 per hour and the service rate is 2 every 15 minutes,what is the average number of customers in the system?

A) 0.50
B) 4.00
C) 2.25
D) 3.00
E) None of the above