Frequency polygon: The following frequency distribution presents the number of murders (including negligent manslaughter) per 100,000 population for each U.S. city with population over 250,000 in a recent year.
Murder Rate Frequency
0.0-4.9 21
5.0-9.9 23
10.0-14.9 12
15.0-19.9 3
20.0-24.9 6
25.0-29.9 0
30.0-34.9 1
35.0-39.9 4
40.0-44.9 0
45.0-49.9 0
50.0-54.9 3