Expected Value Calculator: What It Calculates
Expected Value Calculator focuses on a specific mathematical operation or relationship. The output depends on the values, expression, and conventions used in the calculation.
The Formula or Method
Expected value is the probability-weighted average of possible outcomes: E[X] = Ξ£xP(x) for a discrete variable.
Method behind the result
The calculator applies the mathematical relationship shown above to the values or expression supplied. Keeping the variables and units consistent prevents avoidable errors.
Using Expected Value Calculator
Enter the required numbers or mathematical expression carefully. For formulas involving multiple variables, keep parentheses and signs exactly as intended.
- Identify the variables or values used by the formula.
- Enter them with the correct signs and order.
- Calculate the result.
- Substitute the answer back into the relationship when a verification is practical.
Worked Example
A fair die has expected value 3.5.
Checking the Result
Rounding can slightly change the displayed answer, especially with irrational numbers, logarithms, numerical integration, or repeated operations. Use additional precision when the final result requires it.