A Service Counter Employs Two Servers

Multiple Choice

A service counter employs two servers.On average,a server requires 8 minutes to process a customer and service times follow an exponential distribution.Customers arrive at the counter at the rate of 12 per hour according to a Poisson distribution.The probability that an arriving customer must wait for service is

A) 0.7111
B) 0.8000
C) 0.8576
D) 0.9327