发布网友 发布时间:2022-04-23 02:41
共1个回答
热心网友 时间:2023-10-06 12:37
因为f(x)是随机变量x的概率密度函数
所以
∫f(x)d(x)│(x=-
∞
to
+∞)=1
又因为
f(x)=f(-x)
所以
∫f(x)d(x)│(x=-
a
to
0)=∫f(x)d(x)│(x=0
to
a
)
F(0)=∫f(x)d(x)│(x=-
∞
to
0)=∫f(x)d(x)│(x=0
to
+∞
)=(1/2)*∫f(x)d(x)│(x=-
∞
to
+∞)=1/2
F(-a)=∫f(x)d(x)│(x=-
∞
to
-a)=∫f(x)d(x)│(x=-
∞
to
0)-∫f(x)d(x)│(x=-
a
to
0)=1/2-∫f(x)d(x)│(x=0
to
a
)