结果1 题目 2.已知随机变量X服从参数为λ的泊松分布,且$$ P \{ X = 0 \} = e ^ { - 1 } $$,则$$ \lambda = \_ $$3.设X~N( $$ 5 , 3 ^ { 2 } $$),且$$ P \left\{ X \geq c \right\} = P \left\{ X \leq c \right\} $$,则常数$$ c = . $$4.设打...