__________ deviation taken from A.M. is always equal to zero?
Correct answer: B. Sum
- A. Mean
- B. Sum
- C. Average
- D. 2.D.
Explanation
The algebraic sum of deviations from the arithmetic mean is always zero: Σ(x − x̄) = 0. Individual deviations need not be zero, but their positive and negative values cancel.
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