Which one is the correct formula for variance?
1
Variance = \(\frac{(\Sigma x- \Sigma \bar{x})^2}{N}\)
2
Variance = \(\frac{\Sigma( x- \bar{x})^2}{N}\)
3
Variance = \(\frac{(\Sigma x- \bar{x})^2}{N^2}\)
4
Variance = \(\frac{(\Sigma x^2- \bar{x}^2)}{N}\)