The number of traffic accidents that occur in a city within a period of one month has a Poisson distribution with mean 15. The number of individuals injured in the different accidents is independently distribution as Poisson with mean 2.5 (i.) Find the expected number of people injured in one given month in the city. (ii.) Find the variance of the total number of injured people in a month in the city (iii.) Compute the probability that the total number of people injured in a month is 0