Data from 14

14 cities were combined for a20-year period, and the total 280

280 city-years included a total of 151

151 homicides. After finding the mean number of homicides percity-year, find the probability that a randomly selectedcity-year has the following numbers ofhomicides, then compare the actual results to those expected by using the Poissonprobabilities:

Homicides eachcity-year

a. 0

b. 1

c. 2

d. 3

e. 4

Actual results

164

164

87

87

24

24

4

4

1

1

a. P(0)equals