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Variance
Variance
Oct 15, 2026
1 min read
σ
2
=
Var
(
X
)
=
E
((
X
−
μ
)
2
)
=
E
(
X
2
)
−
E
2
(
X
)
Var
(
a
X
+
b
)
=
a
2
Var
(
X
)
Var
(
c
)
=
0
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