Data from 14 cities were combined for a 20-year period, and the total 280 city-years included a total of 153 homicides. after finding the mean number of homicides per city-year, find the probability that a randomly selected city-year has the following numbers of homicides, then compare the actual results to those expected by using the poisson probabilities: homicides each city-year a. 0 b. 1 c. 2 d. 3 e. 4 actual results 162 89 24 4 1 a. p(0)equals nothing