Question: I am working through an assignment and I am stuck on the last question. Cannot figure out the right formula for this one. Details: The

I am working through an assignment and I am stuck on the last question. Cannot figure out the right formula for this one.

Details: The computer lab at State University has a help desk to assist students working on computer spreadsheet assignments. The students patiently form a single line in front of the desk to wait for help. Students are served based on a first-come, first-served priority rule. Students arrive at the help desk at the rate of 4 every 10 minutes. The average service time is 2 minutes. The Poisson distribution is appropriate for the arrival rate and service times are exponentially distributed.

Details I know:

Arrival rate = 0.4

service rate = 0.5

What is the probability that there are exactly 2 students in the lab?

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