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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.
Report Abuse. Standard deviation is the average distance of each piece of data from the mean. For your example, if the average (mean) score on the test is 66% with a S.D. of 16, this means that 67% of the members of your class had scores in the 66+/-16 points range. The 67% is by definition.eport Abuse. Standard deviation is the average distance of each piece of data from the mean. For your example, if the average (mean) score on the test is 66% with a S.D. of 16, this means that 67% of the members of your class had scores in the 66+/-16 points range. The 67% is by definition.