Bill Youngdahl has been collecting data at the TU student grill. He has found that, between 5:00 PM and 7:00 PM, students arrive at the grill at a rate of 27 per hour (Poisson distributed) and service time takes an average of 2.0 minutes (exponential distribution). There is only 1 server, who can work on only 1 order at a time.
What is the average number of customers in line?