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Calculate mean and variance of binomial (#847)
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Calculate mean and variance of binomial (#847)
Use
E
(
X
)
=
n
p
E(X)=np
E
(
X
)
=
n
p
,
V
a
r
(
X
)
=
n
p
(
1
−
p
)
Var(X)=np(1-p)
V
a
r
(
X
)
=
n
p
(
1
−
p
)
.
