Data from 14 cities were combined for a 20-year period, and the total 280 city-years included a total of

97 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 197 70 12 10