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Standard deviation is the variance from the mean of the data.
The mean is the average value and the standard deviation is the variation from the mean value.
no the standard deviation is not equal to mean of absolute distance from the mean
Standard deviation is how much a group deviates from the whole. In order to calculate standard deviation, you must know the mean.
The standard deviation is a measure of how spread out the numbers are. Three points is needed to calculate a statistically valid meaningful standard deviation.