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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 mean is the average score. The average is calculated by adding all of the scores together, then dividing by the total number of scores. 2  Standard Deviation: This is a measure of variability in a population. A low standard deviation means that most of the data points are very close to the same value.