posted by sharon on .
The university computer lab has 10 computers which are constantly being used by students. Users need help from the one lab assistant fairly often. Students ask for help at a Poisson rate of an average of 4 requests per hour for any one computer. the assistant answers questions as quickly as possible and the service time follows an exponential distribution with mean of 1 minute per help session. What is the probabilty that a student will not get instant help?