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 minute.The average time in minutes a customer spends in the system i.e. ,waiting and being served) is

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