中心就是数学期望
极限就是多做几次随机试验，
大概就这么个意思
【 在 trabalhar 的大作中提到: 】
: 好吧 还是没太明白 怎么就中心 和极限有何关系
: tions “can be explained by one and the same limit theorem,” which plays “a central role in probability theory” [Pólya 1920, 171]. Laplace had discovered the essentials of this fundamental theorem in 1810, and with the designation “central limit theo
: rem of probability theory,” which was even emphasized in the paper’s title, Pólya gave it the name that has been in general use ever since.
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FROM 183.131.109.*