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Measures of Variability of Data I, it says The sum of the deviations from the mean is always zero. However, variance (and its square root,
Measures of Variability of Data I, it says "The sum of the deviations from the mean is always zero." However, variance (and its square root, standard deviation) uses these deviations from the mean as the core of its calculation. Since variance is basically just a variation of the sum of these deviations from the mean, why isn't the variance (and the standard deviation) always zero as well? Please provide full
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