Statisticshard · Past Paper
If the mean of observations $x_1, x_2, ... x_n$ is $\bar{x}$, then $\sum_{i=1}^n (x_i - \bar{x})$ is:
A$n\bar{x}$
B0
C1
D$\bar{x}$
✓ Correct Answer: B — 0
The sum of deviations about the mean is always zero by definition of the mean.
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