The formula we use to find the variance is simple square the formula of standard deviation.
In statistics, Standard deviation is a measure of the variation of a set of values.
The formula we use to find the standard deviation
[tex]\rm \sigma = \sqrt{1/N \sum (X - \mu)^{2} }[/tex]
here,
sigma σ = standard deviation of population
N = number of observation of population
X = mean
μ = population mean
Also,
The formula we use to find the variance
[tex]\rm \sigma^{2} = {1/N \sum (X - \mu)^{2} }[/tex]
The variance is simply the square of the standard deviation.
Learn more about standard deviation and variance:
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