下列各函数中是随机变量分布函数的为_____.()
A.F1(x)=1/1+x2,-∞<x<+∞
B.F2(x)={0,x≤0,{x/(1+x)x>0
C.F3(x)=e-x,-∞<x<+∞
D.F4(x)=3/4+(1/2π)arctanx,-∞<x<+∞
正确答案是B
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