What is the class width for this histogram ( and corresponding GFDT) NOTE: Each class contains its lower class limit, but not it's upper class limit

Data was collected for 359 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 histogram below. 80 60 Frequency 40 20 40 45 50 55 60 65 Number of People in 10 min What is the class width for this histogram (and corresponding GFDT)? Note: Each class contains its lower class limit, but not its upper class limit. Class width =