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Mean Absolute Deviation (MAD):

ASum
BMean
CSD
D(1/n) Σ |x_i - x̄|
Answer & Solution
Correct answer: D. (1/n) Σ |x_i - x̄|
MAD = (1/n) Σ |x_i - mean|. Alternative spread measure (uses absolute values). Less sensitive to outliers than SD. Standard SD penalizes large deviations more.
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