设连续性随机变量X的分布函数为F(X),在X>=0时,F(X)=a+b乘以e的(-x²)/2次方,在x
设连续性随机变量X的分布函数为F(X),在X>=0时,F(X)=a+b乘以e的(-x²)/2次方,在x
数学人气:224 ℃时间:2019-10-19 14:47:38
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由左连续性:在X=0处F(0)=0,带入得a+b=0,F(x)是分布函数,在无穷大处等于1,把x=无穷大带入,得a+b*0=1,解方程组:a=1,b=-1
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