问题如下图:
选项:
A.
B.
C.
解释:
老师,B选项理解了是错误的,能不能解读一下C选项的公式,累计函数F(x)=P(括号里的是什么意思?大X和小X)?谢谢
NO.PZ2018062016000079问题如下Given thx is a screte ranm variable, the corresponng cumulative probability function is F(x), whiof the following is least correct?A.0 ≤ F(x) ≤ 1B.∑F(x)=1C.F(x)=P(X≤ x)B is correct. Baseon the finition of cumulative probability function, F(x)=P(X≤ x) an0 ≤ F(x) ≤ 1 always hol because 0 ≤ p(x) ≤ 1.看提问里说B是错的,但是我选的C,说B是正确答案,搞糊涂了
老师您好,为什么所有的F(X)相加一定是大于1的?
l老师,为什么B不对?