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var·i·ance
[vair-ee-uhns]
NOUN
1.
the state, quality, or fact of being variable, divergent, different, or anomalous.
2.
an instance of varying; difference; discrepancy.
3.
Statistics. the square of the standard deviation.
4.
Physics, Chemistry. the number of degrees of freedom of a system.
5.
an official permit to do something normally forbidden by regulations, especially by building in a way or for a purpose normally forbidden by a zoning law or a building code.
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Source: Dictionary.com
variance | Define variance at Dictionary.com
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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, and it informally measures how far a ...

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 ...

www.statisticshowto.com/variance

Sep 25, 2013 ... Variance measures how far a data set is spread out. Definition, examples of variance. Step by step examples and videos; statistics made ...

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.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 ...

www.sciencebuddies.org/science-fair-projects/project_data_analysis_variance_std_deviation.shtml

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.alcula.com/calculators/statistics/variance

Online calculator to compute the variance from a set of observations from a population or a sample.

www.khanacademy.org/math/statistics-probability/displaying-describing-data/sample-standard-deviation/e/variance

Practice calculating both sample and population variances.