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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.
1 Mean: the average of all values in a data set (add all values and divide their sum by the number of values).  Deviation: the distance of each value from the mean. If the mean is 3, a value of 5 has a deviation of 2 (subtract the mean from the value). Deviation can be positive or negative.