Consider an Espresso Stand with a Single Barista

Multiple Choice

Consider an espresso stand with a single barista.Customers arrive at 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 time in minutes a customer spends waiting in line for service is

A) 0.114 minute.
B) 0.143 minute.
C) 6.84 minutes.
D) 8.58 minutes.