What is the difference between the mean and the median of the data set?

(22, 8, 10, 18, 12, 20)

Let D = difference between mean and median of data.

Mean = (22 + 8 + 10 + 18 + 12 + 20) / 6

Mean = 90/6

Mean = 15

Let m = median

m = 8, 10, 12, 18, 20, 22

m = (12 + 18) / 2

m = 30/2

m = 15

D = M - m

D = 15n - 15

D = 0