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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.
The standard deviation calculation looks complicated at first, but it's really quite simple if we take it step by step. We'll start by finding the mean, or average, of all the scores. To do this, we add up all the scores and divide by the total number of scores. This gives us a mean of 10.5.