Question

what is variance and its formula

Answer 1

Variance (σ2) in statistics is a measurement of the spread between numbers in a data set. That is, it measures how far each number in the set is from the mean and therefore from every other number in the set.

The Formula for Variance Is

\begin{aligned} &\text{variance } \sigma^2 =\frac{ \sum_{i=1}^n{\left(x_i - \bar{x}\right)^2} }{n} \\ &\textbf{where:}\\ &x_i=\text{the } i^{th} \text{ data point}\\ &\bar{x}=\text{the mean of all data points}\\ &n=\text{the number of data points}\\ \end{aligned}variance σ2=n∑i=1n(xi−xˉ)2where:xi=the ith data pointxˉ=the mean of all data pointsn=the number of data points

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