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The mean deviation for any distribution is always 0 and so conveys no information whatsoever.
The standard deviation is the square root of the variance. The variance of a set of values is the sum of the probability of each value multiplied by the square of its difference from the mean for the set.
A simpler way to calculate the variance is
Expected value of squares - Square of Expected value.
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Relation between mean and standard deviation?
Standard deviation is the variance from the mean of the data.
What is the difference between standard deviation and mean?
The mean is the average value and the standard deviation is the variation from the mean value.
Difference between standard deviation and mean devition?
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,
Does standard deviation answer have to be between 3?
No, since "between 3" doesn't mean anything. Do you mean between -3 and +3?
Is the standard deviation the same as the mean of absolute distances from the mean?
no the standard deviation is not equal to mean of absolute distance from the mean
