Standard deviation is the variance from the mean of the data.
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The mean is the average value and the standard deviation is the variation from the mean value.
The mean deviation (also called the mean absolute deviation) is the mean of the absolute deviations of a set of data about the data's mean. The standard deviation sigma of a probability distribution is defined as the square root of the variance sigma^2,
5%
no the standard deviation is not equal to mean of absolute distance from the mean
No, since "between 3" doesn't mean anything. Do you mean between -3 and +3?