**Variance is Statistics - Simple Definition, Formula, How to Calculate**
https://byjus.com/maths/variance/

WebVariance is the expected value of the squared variation of a random variable from its mean value, in probability and statistics. Informally, variance estimates how far a set of numbers (random) are spread out from their mean value. The value of variance is equal to the square of standard deviation, which is another central tool.

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