What is the range? 7, 10, 13, 12, 21, 10, 3, 4
What is the mean absolute deviation (MAD)? 7, 10, 13, 12, 21, 10, 3, 4
What is the Interquartile (IQR) range? 7, 10, 13, 12, 21, 10, 3, 4
If median is the best measure of center, which is the best measure of variability?