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Average Deviation. In statistics, the absolute deviation of an element of a data set is the absolute difference between that element and a given point. The average deviation of a data set is the average of the absolute deviations. The average deviation is also called the average absolute deviation.
The deviations are 3, 2, 1 and zero, which have a sum of 6. If you divide 6 by the number of data points, 4, you get an average deviation of 1.5. Percent Deviation from Mean and Average. The mean and average deviation are used to find the percent deviation. Divide the average deviation by the mean, then multiply by 100.