Data was collected for 286 randomly selected 10-minute intervals. For each ten-minute interval, the number of people entering the atrium of a large hall were recorded. The data is summarized in the histogram below. Frequency 80 60 40 20 100 105 110 115 120 125 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=

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