Standard deviation = \(\frac{\sum(x - \overline{x})^2}{\text{n}}\) \(\overline{x}\) = \(\frac{ 3 + 6 + 4 + x + 7}{5}\) = 5 = 20 + x = 25 x = 25 - 20 = 5. x x - \(\overline{x}\) (x - \(\overline{x}\))\(^2\) 3 3 - 5 -2 = 4 4 4 - 5 -1 = 1 5 5 - 5 0 = 0 6 6 - 5 1 = 1 7 7 - 5 2 = 4 \(\sum\) (x - \(\overline{x}\))\(^2\) = 10 Standard deviation = \(\frac{\sum(x - \overline{x})^2}{\text{n}}\) = \(\frac{\sqrt{10}}{5}\) = \(\sqrt{2}\)