At a production machine, parts arrive according to a Poisson process at the rate of 0.35 parts per minute. Processing time for parts has an exponential distribution with a mean of 2 minutes. What is the probability that a random part arrival finds that there are already 8 parts in the system (in machine + in the queue)

At a production machine, parts arrive according to a Poisson process a

1.	At a production machine, parts arrive according to a Poisson process at the rate of 0.35 parts per minute. Processing time for parts has an exponential distribution with a mean of 2 minutes. What is the probability that a random part arrival finds that there are already 8 parts in the system (in machine + in the queue)
A.	0.0247
B.	0.0576
C.	0.0173
D.	0.082
Answer» D. 0.082