\[1)\ Два.\]
\[p = 0,02;\ \]
\[q = 1 - 0,02 = 0,98;\]
\[P = P_{5}(2) = C_{5}^{2} \bullet {0,02}^{2} \bullet {0,98}^{5 - 2} =\]
\[= \frac{5!}{2!(5 - 2)!} \bullet {0,02}^{2} \bullet {0,98}^{3} =\]
\[= \frac{5 \bullet 4 \bullet 3!}{2 \bullet 3!} \bullet {0,02}^{2} \bullet {0,98}^{3} \approx 0,0038.\]
\[Ответ:\ \ P \approx 0,0038.\]
\[2)\ Не\ более\ двух.\]
\[p = 0,02;\ \]
\[q = 1 - 0,02 = 0,98;\]
\[P = P_{5}(0) + P_{5}(1) + P_{5}(2) =\]
\[Ответ:\ \ P \approx 0,9999.\]