Definitions
 Mean: average of data
 Absolute Value: distance a number is from zero on a number line
 Deviation: measure of variability that shows how far a number is from the overall pattern of data

Steps to find MAD
Step 1: Find the mean of the data.
Step 2: Find the difference of each number from the mean.
Step 3: Add the differences and divide by the number of data.
(MAD)

Finding the Mean Review
Directions: Find the mean of the data below:
5, 7, 1, 2, 8, 10, 1, 7, 1, 2
Step One: Add the numbers together.
5 + 7 + 1 + 2 + 8 + 10 + 7 + 1 + 2 = ?
5 + 7 + 1 + 2 + 8 + 10 + 7 + 1 + 2 = 44
Step Two: Count how many numbers there are in the data:
There are 10 numbers in the data.
Step Three: Divide the sum of the data by the number of the data:
44 / 10 = ?
44 / 10 = 4.4

You Try!!!
Find the mean of the data below:
10, 20, 20, 20, 10, 40, 50, 70

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Finding Mean Absolute Deviation

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Finding Mean Absolute Deviation

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Finding Mean Absolute Deviation

Finding Mean Absolute Deviation
Directions: Find the mean absolute deviation of the data below:
8, 10, 14, 11, 11, 15, 10, 9
*This time…the mean is not given to you! You need to find it first!!!
Step One:
The mean is 11. There are 8 numbers in the data set.

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Finding Mean Absolute Deviation


Finding Mean Absolute Deviation