Variance is an average of square deviation from the arithmetic mean.

Other name: Average square deviation

Formula:

Example:

Special for only ** two ** positive numbers and , we have Variance

Example:

, , then

To give you better understanding on the computation of variance, you may want to try with your own input data using the interactive Variance program below. To use the program, simply type your input data (only numbers input are accepted) in the box below, separated by comma. Then click "Get Variance" button.

See also: Variance and standard deviation, Average absolute deviation, Mean and Average, Recursive Variance

Rate this tutorial or give your comments about this tutorial

**Preferable reference for this tutorial is**

Teknomo, Kardi,Mean and Average. http:\\people.revoledu.com\kardi\ tutorial\BasicMath\Average\