\[\boxed{\mathbf{1206}\mathbf{.}}\]
\[1)\ \overline{X} =\]
\[= \frac{2 \bullet 2 + 3 \bullet 2 + 4 \bullet 1 + 6 \bullet 3}{2 + 2 + 1 + 3} =\]
\[= \frac{4 + 6 + 4 + 18}{8} = \frac{32}{8} = 4.\]
\[Дисперсия\ совокупности\ \]
\[значений:\]
\[= \frac{2 \bullet 2^{2} + 2 \bullet 1^{2} + 1 \bullet 0^{2} + 3 \bullet 2^{2}}{8} =\]
\[= \frac{2 \bullet 4 + 2 + 3 \bullet 4}{8} =\]
\[= \frac{8 + 2 + 12}{8} = \frac{22}{8} = 2,75.\]
\[\sigma = \sqrt{D} = \sqrt{2,75} \approx 1,65.\]
\[2)\ \overline{X} =\]
\[= \frac{- 5 \bullet 2 - 2 \bullet 3 + 2 \bullet 4 + 3 \bullet 2}{2 + 3 + 4 + 2} =\]
\[= \frac{- 10 - 6 + 8 + 6}{11} = - \frac{2}{11} \approx\]
\[\approx - 0,18.\]
\[Дисперсия\ совокупности\ \]
\[значений:\]
\[= \frac{46,46 + 9,93 + 19 + 20,22}{11} =\]
\[= \frac{95,61}{11} \approx 8,69.\]
\[\sigma = \sqrt{D} = \sqrt{8,69} \approx 2,94.\]