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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 Standard deviation is normally 15 points. 2  95% of the population lies with two SDs of the average, meaning that the vast, vast majority of people have an IQ between 70 and 130 always assuming SD=15 (think of your standard bell curve). 3  98% of people lie below 131.