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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.
If the standard deviation is small then the population doesn't vary much, and if the s.d. is large then the population varies a lot. In a normal distribution 34% of people will have a score within one standard deviation, so that means that 34% of the population have a score between 85 and 100.Likewise 34% of the population have a score between 100 and 115. Source(s): Aaron Â· 3 years ago.est Answer: The mean is the average intelligence, i.e. there are as many people with an intelligence above 100 as there are with an intelligence below 100 the standard deviation is a measure of how far the population differs.