The variance of a set of value x₁, x₂, …, $$x_n$$​ is given by which of the following formulae?

The correct formula for the variance of a set of values $$x_1, x_2, \dots, x_n$$​ is:

​$$\text{Variance} = \frac{\sum x^2}{n} - \left( \frac{\sum x}{n} \right)^2$$​​