1. Mean Absolute Deviation
M . A. D.
Mean Absolute Deviation
MAD

2. 3, 7, 7, 4, 6, 9 Step 1: Take the MEAN! 3+7+7+4+6+9 = 36 ÷ 6 = 6
M. A. D.
3, 7, 7, 4, 6, 9 Step 1: Take the MEAN! = 36 ÷ 6 = 6

3. M. A. D. 3 1 2 M.A.D = 1.67 3, 7, 7, 4, 6, 9 Mean = 6 STEP 2: STEP 3:
Make a New List of Numbers: 3 1 2
STEP 2:
Subtract the MEAN from each number in the data set.
6 - 3 = 3
6 - 7 = -1 (Take the ABSOLUTE VALUE) = 1
6 - 4 = 2
6 – 6 = 0
6 – 9 = 3
LAST STEP!
Take the MEAN again!
= 10
10 ÷ 6 = 1.67
M.A.D = 1.67

4. Your Turn!
Find the M.A.D:
12, 14, 21, 12, 26
102, 98, 79, 67, 89

5. 12, 14, 21, 12, 26

6. 102, 98, 79, 67, 89