alleryWhich of the following is true about the mean of deviations from the mean?
AIt equals the standard deviation
BIt is always positive
CIt is undefined
DIt is always zero (deviations cancel out)
Answer & Solution
Correct answer: D. It is always zero (deviations cancel out)
$\sum (x_i - \bar{x}) = 0$ always.
This is why mean deviation uses **absolute** values.
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