# Expected Value Calculator

This expected value calculator helps you to quickly and easily calculate the expected value (or mean) of a discrete random variable X. Enter all known values of X and P(X) into the form below and click the "Calculate" button to calculate the expected value of X. Click on the "Reset" to clear the results and enter new values.

### This calculator uses the following basic formula:

E(X) = μ_{X} = x_{1}P(x_{1}) + x_{2}P(x_{2}) + ... + x_{n}P(x_{n})

_{X}=

_{ i}* P(x

_{i})

*Where:*

*E(X) is the expected value of the random variable X ,*

*μ _{X} is the mean of X ,*

*∑ is the summation symbol ,*

*P(x _{i}) is the probability of outcome x_{i} ,*

*x _{i} is the i^{ th} outcome of the random variable X ,*

*n is the number of possible outcomes ,*

*i is a possible outcome of the random variable X.*

You may also be interested in our Point Estimate Calculator