Question

What is the MAD of the data set?

Answer 1

MAD stands for Mean absolute deviation. How to calculate it?

1) arrange the data from smaller to greater (although it is not important here)

2) find the mean =(3+6+7+11+13)/5 = 8


3) subtract the mean from each data point & keep their absolute value (Positive)

I3-8I = 5

I6-8I = 2

I7-8I = 1

I11-8I = 3

I13-8I = 5

Find now the new mean of the latter (5+2+1+3+5)/5 = 16/5 = 3.2 (MAD)
which indicates the deviation from the original mean

Answer 2

Question: What is the MAD of the data set?
13, 6, 3, 7, 11

Your mean would be: 8

But your answer would have to be: 3.2