Data was collected for 316 randomly selected 10 minute intervals. For each ten-minute interval, the number of people entering the atrium of a large mall were recorded. The data is summarized in the table below.

Number   of Guests	Frequency
100 – 104	68
105 – 109	35
110 – 114	31
115 – 119	89
120 – 124	93

What is the class width for this Frequency Distribution Table?

Class width =