1,F(+∞) = lim (x->+∞) A[1 - e^(-x)] = 1
A = 1
2,X的密度函数:f(x) = F'(x) = e^(-x) x >= 0
f(x) = 0 x < 0
3,P(1
(1)令:F(+∝) = 1,得: A=1.
(2)求导数,得f(x)=F'(x)
x>=0时, f(x) =e^(-x) ,
x<0 时f(x) = 0.
(3) P(1