Stefano calculated the mean absolute deviation for the data set 32, 4, 12, 40, 20, and 24. His work is shown below.

Step 1: Find the mean.

mean = StartFraction 32 + 4 + 12 + 40 + 20 + 24 Over 6 EndFraction = 22

Step 2: Find each absolute deviation.

10, 18, 10, 18, 2, 2

Step 3: Find the mean absolute deviation.

M A D = StartFraction 10 + 18 + 10 + 18 + 2 + 2 Over 4 EndFraction = 15

What is Stefano’s error?