Consider an Espresso Stand with a Single Barista

Multiple Choice

Consider an espresso stand with a single barista.Customers arrive to the stand at the rate of 28 per hour according to a Poisson distribution.Service times are exponentially distributed with a service rate of 35 customers per hour.The average number of customers waiting in line for service is

A) 4.0
B) 3.8
C) 3.5
D) 3.2