User:Yungam99
Geometric distribution case
If X is a random variable and has Geometric distribution (the parameter is p, and the number of event is k),
![{\displaystyle \operatorname {E} [X]=\sum _{k=1}^{\infty }kp(1-p)^{k-1}={\frac {1}{p}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/c0f96958b17c7f9f48f7d2c39d84b9b8e05813a4)
because it can be derived from the equation below.
If X is a random variable and has Geometric distribution (the parameter is p, and the number of event is k),
because it can be derived from the equation below.
