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Mean deviation about a value $a$ is calculated using:

Acubed deviations
Babsolute values of deviations
Csigned deviations (without absolute value)
Dsquared deviations
Answer & Solution
Correct answer: B. absolute values of deviations
M.D.($a$) = mean of **absolute values** of deviations from $a$. (Squaring is used in standard deviation, not M.D.)
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