<span>The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers. - </span>(13 + 18 + 13 + 14 + 13 + 16 + 14 + 21 + 13) ÷ 9 = 15<span>The "median" is the "middle" value in the list of numbers. - </span>13, 13, 13, 13, 14, 14, 16, 18, 21... So the median would be 14.<span>The "mode" is the value that occurs most often. If no number is repeated, then there is no mode for the list. - So the mode would be 13 </span>The "range" is just the difference between the largest and smallest values. - 21-13= 8
