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Mathematics
Problem
Explain in one or two sentences why
∑
i
=
1
n
(
x
i
−
x
ˉ
)
=
0
\sum_{i=1}^{n} (x_i - \bar{x}) = 0
∑
i
=
1
n
(
x
i
−
x
ˉ
)
=
0
for any set of
n
n
n
observations.
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