摘要： When I was studying Philosophy at Berkeley, a friend told me that she could tell who was going to be rich and who was not. Fascinating, I thought. But... 阅读全文

摘要： Part 1: MomentsDefinition 1 For each integer $n$, the nth moment of $X$, $\mu_n^{'}$ is\[\mu_{n}^{'} = EX^n.\]The nth central moment of $X$, $\mu_n$, ... 阅读全文