Expected Value

Introduction

The expected value E(X) is the arithmetic mean of a random variable X.

Definition

1. Let X be a discrete random variable and the range is  , then

E(X)=\sum_{x\in R_{X}}^{}xf_{x}(x)

2. Let X be a continuous random variable and the range is  , then

E(X)=\int_{x\in R_{X}}^{}xf_{x}(x)dx

(Visited 11 times, 1 visits today)