StudyDex
Search…
k
Home
My StudyDex
Past Papers
Search
A-Level
GCSE
IGCSE
Classes
Terms
© 2026 StudyDex Ltd
Calculate mean and variance of geometric (#856)
Learn
Examples
Practice
Calculate mean and variance of geometric (#856)
Use
E
(
X
)
=
1
p
E(X)=\frac{1}{p}
E
(
X
)
=
p
1
,
V
a
r
(
X
)
=
1
−
p
p
2
Var(X)=\frac{1-p}{p^2}
V
a
r
(
X
)
=
p
2
1
−
p
.
