Question

X服从参数为1的指数分布p（x）=e^-x,x>0;0,x为其余,求 条件概率p(X>5/X>3)等于?

Answer 1

P（X>5|X>3）=P(X>5,X>3)/P(X>3)=P(X>5)/P(X>3)=[1-F(5)]/[1-F(3)].F（x）为其分布函数.

f(x)=e^-x,x>0;

0,x为其余 对应的分布函数为F（x）=1-e^-x x>0

0 x