Use the cereal data for 1 3. Sodium in Breakfast Cereals (mg per 1 cup) 0 340 70 140 200 180 210 150 100 130 140 180 190 160 290 50 220 180 200 210 1. Create a frequency distribution starting with a lower class limit of zero and a class width of 40. Add a column for relative frequencies (expressed as percentages.)