Deviations are calculated from some value: the mean, the median, the maximum or whatever. You subtract that value from each observed value.
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You calculate the mean.For each observation, you calculate its deviation from the mean.Convert the deviation to absolute deviation.Calculate the mean of these absolute deviations.
The mean average deviation is the same as the mean deviation (or the average deviation) and they are, by definition, 0.
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Square the standard deviation and you will have the variance.
In the same way that you calculate mean and median that are greater than the standard deviation!