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Calculate mean and variance of Poisson (#851)
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Calculate mean and variance of Poisson (#851)
Use
E
(
X
)
=
λ
E(X) = \lambda
E
(
X
)
=
λ
,
V
a
r
(
X
)
=
λ
Var(X) = \lambda
V
a
r
(
X
)
=
λ
.
