To find the mean of a set, add up all of the data points and divide by the number of data points. For the first set: (14+18+21+15+17) ÷ 5 = 85 ÷ 5 = 17 For the second set: (15+17+22+20+16) ÷ 5 = 90 ÷ 5 = 18
To find the MAD (mean absolute deviation) of a set, find the mean of the distances of each data point from the mean. For the first set: (3+1+4+2+0) ÷ 5 = 10 ÷ 5 = 2 For the second set: (3+1+4+2+2) ÷ 5 = 12 ÷ 5 = 2.4
To find the means-to-MAD ratio of a set, divide its mean by its MAD. For the first set: 17 ÷ 2 = 8.5 For the second set: 18 ÷ 2.4 = 7.5
