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Calculate mean and variance of exponential (#872)
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Calculate mean and variance of exponential (#872)
Use
E
(
X
)
=
1
λ
E(X) = \frac{1}{\lambda}
E
(
X
)
=
λ
1
,
V
a
r
(
X
)
=
1
λ
2
Var(X) = \frac{1}{\lambda^2}
V
a
r
(
X
)
=
λ
2
1
.
