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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.
Thus, the average value of the numbers in the set is 16.2, even though none of them is exactly 16.2. To find the Standard Deviation, you need the average value of the numbers in the set (the Mean), as well as the total number of values in the set, and the values themselves.