设随机变量x~u(-1,1),则p{|x|≤0.5}=?求详解
问题描述:
设随机变量x~u(-1,1),则p{|x|≤0.5}=?求详解
答
= = !什么哦!说清楚点呀?
答
p{|x|≤0.5}=P(-0.5≤X≤0.5)=P(X≤0.5)-P(X≤-0.5)=F(0.5)-F(-0.5)=3/4-1/4=1/2