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Bupt_Luke
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伽马函数
当e的次数带有x^2时，利用dx^2=2xdx进行替换原创 2020-08-28 03:00:20 · 925 阅读 · 0 评论 -
X~exponential 指数分布
X~exponential 指数分布f(x)是概率密度函数原创 2020-08-27 18:10:46 · 1171 阅读 · 0 评论 -
方差公式Var(x)=E(x^2)-[E(x)]^2，求期望值
E(x)已经是常数，再E一次E(E(x))还是E(x)看了一个题求Var(3-x)代入算即可。原创 2020-08-26 16:30:40 · 22573 阅读 · 0 评论 -
贝叶斯公式
Only 1 in 1000 adult is afflicted with a rare disease for which a diagnostic test has been developed. The test is such that, when an individual actually has the disease, a positive result will diagnostic 99% of the time, while an individual without the dis原创 2020-08-24 01:34:55 · 176 阅读 · 0 评论