stephanie_liu · 2025年05月06日
NO.PZ2024120401000060
问题如下：
For the cumulative distribution function (CDF) F(X), which of the following is incorrect?
选项：
A.
F(-∞)=0 and F(∞)=1
B.
F(X) is a non - decreasing function such that if x₂>x₁ then F(x₂)≥F(x₁)
C.
P(X
D.
P(x₁≤X≤x₂)=F(x₂) - F(x₁)
解释：
A选项不太懂，麻烦解答
NO.PZ2024120401000060 问题如下 For the cumulative stribution function (C) F(X), whiof the following is incorrect? A.F(-∞)=0 anF(∞)=1 B.F(X) is a non - creasing function suthif x₂ x₁ then F(x₂)≥F(x₁) P(X k)=1 - F(k) P(x₁≤X≤x₂)=F(x₂) - F(x₁) 看了这个解析https://class.pzacamy.com/qa/186951那为啥还选C呢？
NO.PZ2024120401000060问题如下 For the cumulative stribution function (C) F(X), whiof the following is incorrect? A.F(-∞)=0 anF(∞)=1B.F(X) is a non - creasing function suthif x₂ x₁ then F(x₂)≥F(x₁)P(X k)=1 - F(k)P(x₁≤X≤x₂)=F(x₂) - F(x₁) 如题，C的P(x =k)这里为什么等于号就不能省略，我理解这里说的是P(X =k)的反面，正常难道不应该是X k吗？但还有一条规则是连续的随机变量就一定要加上“=”号，可以再一下为什么吗？
