1. MEAN
ABSOLUTE
DEVIATION
*MAD*

2. Add them all up and Divide by the number of data
Mean:
Add them all up and
Divide by the number of data
Absolute:
The distance from zero.
Always a positive number!
Deviation:
How something is different.
In this case, from the mean.

3. MEAN
The mean of the data set is its average.
5, 8, 10, 12, 13, 13, 14
Mean = 10.71

4. Mean Absolute Deviation (MAD)
The mean absolute deviation of a numerical data set is the average deviation of the data from the mean.
What in the world is that?

5. How do I do that???? Step 1: Find the mean
Step 2: Subtract the mean from each data
Step 3: Take the absolute value of each difference
Step 4: Add it up and divide by the number of data (find the mean again!)

6. Step 3: Absolute Value (no neg sign)
MAD
The numbers below are the golf scores for the UGA golf team. Find the mean absolute deviation of the data.
68, 70 , 72, 73, 74, 75
Step 1:
Find the Mean
Step 2:
Subtract
Value-Mean
Step 3: Absolute Value (no neg sign)
Step 4:
Find the Mean Again!

7. Step 3: Absolute Value (no neg sign)
Find the MAD of the following Florida State University 2013 Football scores:
41, 62, 54, 48, 63, 51, 49, 41, 59, 59, 80, 37, 45, 31
Step 1:
Find the Mean
Step 2:
Subtract
Value-Mean
Step 3: Absolute Value (no neg sign)
Step 4:
Find the Mean Again!

8. Step 3: Absolute Value (no neg sign)
Find the MAD of the following set of test scores.
You Try!
70, 73, 74, 74, 81, 88, 89, 90, 92, 95, 96
Step 1:
Find the Mean
Step 2:
Subtract
Value-Mean
Step 3: Absolute Value (no neg sign)
Step 4:
Find the Mean Again!