Let X be the Poisson random variable. It is given that mean
λ = 300/hour = 300/60 minutes = 5 per minute.
(a) The Poisson law giving x vehicles passing on a road in one minute is given by
(b) E(X) = λ (i.e) No of vehicles passing per minute, since λ = 5, the expected number passing in two minutes is 10.