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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.
Standard Deviation and STDEV Function Overview. The standard deviation is a statistical tool that tells you roughly how far, on average, each number in list of data values varies from the average value or arithmetic mean of the list itself. For example for the numbers 1, 2.