Questão 3309305

\(\sqrt{\frac{1}{n}\sum_{i\ =\ 1}^nX_i}\)

\(\sqrt{\frac{1}{n}\sum_{i\ =\ 1}^nX_i^{^2}}\)

\(\sqrt{\frac{1}{n\ -\ 1}\sum_{i\ =\ 1}^nX_i^{^2}}\)

\(\sqrt{\frac{1}{n}\sum_{i\ =\ 1\ }^n\left(X_i\ -\ \overline{X}\right)^2}\)

\(\sqrt{\frac{1}{n-1}\sum_{i\ =\ 1}^n\left(X_i-\overline{X}\right)^2}\)