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en.wikipedia.org/wiki/Variance

In probability theory and statistics, variance is the expectation of the squared deviation of a random variable from its mean. Informally, it measures how far a set ...

www.statisticshowto.com/probability-and-statistics/variance

Variance measures how far a data set is spread out. Definition, examples of variance. Step by step examples and videos; statistics made simple!

www.investopedia.com/terms/v/variance.asp

The spread between numbers in a data set, measuring Variance is calculated by taking the differences between each number and the mean, squaring the ...

mathworld.wolfram.com/Variance.html

The variance is therefore equal to the second central moment mu_2 . Note that some care is needed in interpreting sigma^2 as a variance, since the symbol ...

www.khanacademy.org/math/ap-statistics/summarizing-quantitative-data-ap/measuring-spread-quantitative/v/sample-variance

Thinking about how we can estimate the variance of a population by looking at the data in a sample.

www.sciencebuddies.org/science-fair-projects/science-fair/variance-and-standard-deviation

In order to write the equation that defines the variance, it is simplest to use the summation operator, Σ. The summation operator is just a shorthand way to write,  ...

www.merriam-webster.com/dictionary/variance

Define variance: the fact, quality, or state of being variable or variant : difference, variation — variance in a sentence.

www.dictionary.com/browse/variance

Variance definition, the state, quality, or fact of being variable, divergent, different, or anomalous. See more.

www.mathsisfun.com/data/standard-deviation.html

Standard Deviation and Variance. Deviation just means how far from the normal. Standard Deviation. The Standard Deviation is a measure of how spread out ...