\[\boxed{\mathbf{313.}}\]
\[\textbf{а)}\ 2,\ 3,\ 7\ и\ 1,\ 2,\ 3\]
\[1)\ \overline{x} = \frac{2 + 3 + 7}{3} = 4;\]
\[(2 - 4)^{2} = 4;\]
\[(3 - 4)^{2} = 1;\]
\[(7 - 4)^{2} = 9\]
\[Дисперсия:\ \]
\[\frac{4 + 1 + 9}{3} = \frac{14}{3} = 4\frac{2}{3}.\]
\[2)\ \overline{x} = \frac{1 + 2 + 3}{3} = 2;\]
\[(1 - 2)^{2} = 1;\]
\[(2 - 2)^{2} = 0;\]
\[(3 - 2)^{2} = 1\]
\[Дисперсия:\ \]
\[\frac{1 + 0 + 1}{3} = \frac{2}{3}.\]
\[Ответ:дисперсия\ первого\ \]
\[набора\ чисел\ больше.\]
\[\textbf{б)}\ 2,\ 3,\ 4,\ 7\ и\ 1,\ 5,\ 6,\ 8\]
\[1)\ \overline{x} = \frac{2 + 3 + 4 + 7}{4} = \frac{16}{4} = 4;\]
\[(2 - 4)^{2} = 4;\]
\[(3 - 4)^{2} = 1;\]
\[(4 - 4)^{2} = 0;\]
\[(7 - 4)^{2} = 9.\]
\[Дисперсия:\]
\[\frac{4 + 1 + 0 + 9}{4} = \frac{14}{4} = 3,5.\]
\[2)\ \overline{x} = \frac{1 + 5 + 6 + 8}{4} = \frac{20}{4} = 5;\]
\[(1 - 5)^{2} = 16;\]
\[(5 - 5)^{2} = 0;\]
\[(6 - 5)^{2} = 1;\]
\[(8 - 5)^{2} = 9.\]
\[Дисперсия:\]
\[\frac{16 + 0 + 1 + 9}{4} = \frac{26}{4} = 6,5.\]
\[Ответ:дисперсия\ второго\ \]
\[набора\ чисел\ больше.\]