Customers Arrive Every Three Minutes Governed by a Poisson Distribution

Multiple Choice

Customers arrive every three minutes governed by a Poisson distribution.A single server is capable of handling twenty-five customers per hour and this service time is exponentially distributed.What is the percentage of the server's six-hour shift is one customer receiving service while and two are waiting in line?

A) 5%
B) 10%
C) 15%
D) 21%