Statisticshard · Past Paper
If the sum of squares of deviations of 10 observations from their mean is 0, then:
AAll observations are zero
BMean is zero
CAll observations are identical
DCannot say
✓ Correct Answer: C — All observations are identical
Sum of squares of deviations is 0 only if every (x - mean)^2 is 0, meaning every x = mean.
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