Var Discreta
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Discrete Variance calculator is an important statistical tool for calculating the variation of a discrete variable. It is used in various fields, such as data science, engineering, and economics. The formula for calculating the variation is E[X²] − (E[X])².
This calculator is useful in cases where you need to calculate the variation of a discrete probability distribution. For example, you can use it to calculate the variation of a variable representing the number of failures in a computer system.
Remember that the variation is an important measure of the data dispersion. Therefore, it is crucial to calculate the variation correctly to draw accurate conclusions from the data. Feel free to use this calculator to calculate the variation of your discrete variable.
Frequently asked questions
What is the variation of a discrete variable?
The variation of a discrete variable is a measure of the data dispersion. It is calculated using the formula E[X²] − (E[X])².
When should I use the Discrete Variance calculator?
Use the Discrete Variance calculator when you need to calculate the variation of a discrete probability distribution, such as the number of failures in a computer system.
Why is it important to calculate the variation correctly?
Calculating the variation correctly is crucial to draw accurate conclusions from the data. The variation is an important measure of the data dispersion.
What is the formula E[X²] − (E[X])²?
The formula E[X²] − (E[X])² is used to calculate the variation of a discrete variable.