Cellphone marketing generates business through the number of people reached. The number of people reached is modelled by a Poisson process with a rate of (it = 2 per ve minutes. Of those reached, 10% result in a sale. Let Y be the number of those who will result in a sale in the next four hours. Find the following {use R): e E0\") 0 Standard deviation 0(Y) o P(Y :> 10 . P5 c: Y 1: 12) o P{Y = 15)