Answer
Lower class limit for the first class: 100.0
Class width: 100.0
Work Step by Step
100.0 is slightly lower than 119.8, the smallest violent-crime rate observed in 2009.
Largest violent-crime rate: 1345.9
Smallest violent-crime rate: 119.8
Number of classes: 13
$Class~width\approx\frac{1345.9-119.8}{13}\approx100.0$
Observe that all the given rates will be within a class.
See the Guidelines on page 86.
