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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 is  a statistical term that refers to distribution. Basically think of it as the number of points between the next break in grades. The scores that are 30 points above and 30 points below the mean represent the scores of the majority of the class.