\[\mathbf{1.\ }\]
\[P = \frac{1}{2} \bullet \frac{1}{2} = \frac{1}{4}.\]
\[Ответ:\ \ \frac{1}{4}.\]
\[\mathbf{2}.\]
\[P = 1 - p = 1 - 0,05 = 0,95.\]
\[Ответ:\ \ 0,95.\]
\[\mathbf{3}.\]
\[P = \frac{2}{2 + 3 + 10} + \frac{3}{2 + 3 + 10} =\]
\[= \frac{2}{15} + \frac{3}{15} = \frac{5}{15} = \frac{1}{3}.\]
\[Ответ:\ \ \frac{1}{3}.\]
\[\mathbf{4}\text{.\ }\]
\[P = \frac{3}{3 + 5} \bullet \frac{5}{2 + 5} = \frac{3}{8} \bullet \frac{5}{7} = \frac{15}{56}.\]
\[Ответ:\ \ \frac{15}{56}.\]
\[\mathbf{5}\text{.\ }\]
\[P = p \bullet p = 0,8 \bullet 0,8 = 0,64.\]
\[Ответ:\ \ 0,64.\]
\[\mathbf{6}\text{.\ }\]
\[P = \frac{m}{n} = \frac{15}{20 - 1} = \frac{15}{19}.\]
\[Ответ:\ \ \frac{15}{19}.\]