6, 9, 10, 8 and 7 S.D = \(\sqrt{V}\) S.D = standard deviation, V = variance V = \(\frac{\sum({x - \overline{x})^2}}{n}\) Mean(\(\overline{x}\)) = \(\frac{6 + 9 + 10 + 8 + 7}{5}\) = 8 x x - \(\overline{x}\) (x - \(\overline{x}\))\(^2\) 6 6 - 8 = -2 4 9 9 - 8 = 1 1 10 10 - 8 = 2 4 8 8 - 8 = 0 0 7 7 - 8 = -1 1 TOTAL = 10 V = \(\frac{\sum({x - \overline{x})^2}}{n}\) = \(\frac{10}{5}\) = 2 S.D = \(\sqrt{V}\) = \(\sqrt{2}\) = 1.414 ≈ 1.4