A percentage frequency distribution is the same as a frequency distribution, except the number in each category (or group) is divided by the total of the numbers in all categories (or groups), and the result multiplied by 100%. Example Suppose I have the following histogram. A | x x x x b | x x x x x x x c | x x x d | x x x e | x x f | x I have 20 total samples. The number and percentage in each category is a | 4/20*100% = 20% b | 7/20*100% = 35% c | 3/20*100% = 15% d | 3/20*100% = 15% e | 2/10*100% = 10% f | 1/20*100% = 5% Note that these add to 100%. (If rounding is involved, your total of percentages may be different from 100% by 1 or 2 percent.) So, my percentage frequency distribution table is Group Percentage a 20% b 35% c 15% d 15% e 10% f 5%