Data was collected for 236 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 60 40 ET 20 Frequency 220 240 260 280 300 Number of People in 10 min 320 Q 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