Which property of the arithmetic mean states that the sum of deviations from the mean is always zero?
A. Linearity
B. Invariance under change of origin
C. Minimum sum of squared deviations
D. Sum of deviations property
Answer: Option D
Solution (By JKSSB Mock Tests)
The sum of deviations of all observations from their arithmetic mean is always zero, i.e., Σ(x - x̄) = 0, which is a fundamental algebraic property of the mean.
Explanation:
MMR = (Number of maternal deaths due to pregnancy-related causes / Number of live births) × 100,000. This ratio focuses on the risk per childbirth event, standardizing for comparison across populations.
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