概率密度求分布函数一道习题.(1)F(x)=(1/2)e^x-∞<x<0;=

(1) F(x) = (1/2)e^x -∞<x<0;
= 1-(1/2)e^(-x) 0=<x<+∞.

⑵ P(0≤X≤1) = 积分0到1 (e^(-x)) = (1/2)(1-e^(-1))

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