Mean Absolute Deviation

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Presentation transcript:

Mean Absolute Deviation

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

Finding Mean Absolute Deviation

Finding Mean Absolute Deviation

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.

Finding Mean Absolute Deviation

Finding Mean Absolute Deviation