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刘畅1 · 2020年01月31日

问一道题:NO.PZ2020011101000054

问题如下:

A random draw from an N(1,5) distribution is 1.2. If this was generated using the inverse of the cumulative distribution approach, what is the original draw from the U(0,1) distribution?

选项:

解释:

Essentially, the question is to determine the cumulative distribution up to 1.2 on an N(1,5) distribution. This can be done with the Excel function NORMDIST(1.2,1,sqrt(5),True) and returns the value 0.535.

答案没看懂,能详细解释一下吗

1 个答案

品职答疑小助手雍 · 2020年02月06日

同学你好,他问的其实是如果从0,1这个正态分布的累计概率函数发起,变成1,5这个正态分布得到1.2,那么原来1.2这个点对应的是百分之多少的累计概率。

解析的意思是从负无穷到这个点的累计概率在前后两个分布里是一样的。

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