Question 1198161
calls arriving- poisson distribution with an approximate average rate of 10/h.
calls answered- poisson distribution with an approximate average rate of 15/h. 
What is the average time between incoming calls? 6min
What is the average number of calls that the technician can attend in 1h? 15
What is the probability of there being exactly four calls on hold at a given time?
 poissonpdf(19,10) = ,0037
What is the probability of the number of calls in the system exceeding 10?
 1 - poisson(10,10 ) = 1-0.583 = .417