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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.
A standard deviation in IQ points is 15, so 68.2% of the population will have scores between 85 and 115. This is labeled an average IQ, which is just a name for a group of people scoring around the average score.