Concept

Variance

The variance is a measure of spread of a set of data that measures how much the data elements deviate from the mean. Mathematically, the variance is the average of the squares of the difference between each data value and the mean
The variance is the square of the standard deviation so it is usually denoted as
The applet below calculates the variance in the data set on the number line. Points can be moved to change the data.
Applet that calculates the variance of a set of five data values
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