just keep it in minutes
in part a and in part b
(a)
(b)
Suppose that the number of inquiries arriving at a certain interactive system follows a Poisson distribution with arrival rate of 12 inquiries per minute. Find the probability of 10 inquiries arriving
(a) in a 1-minute interval
(b) in a 3-minute interval
I am unsure if the rate is 60/12 or 12/60.