Spawn-Failed

Recently, I’ve met a problem like this when I deploying my blog. hexo d gets error.

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ssh: connect to host github.com port 22: Connection timed out
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
FATAL Something's wrong. Maybe you can find the solution here: https://hexo.io/docs/troubleshooting.html
Error: Spawn failed
at ChildProcess.<anonymous> (D:\Study\Blog\node_modules\hexo-util\lib\spawn.js:52:19)
at ChildProcess.emit (events.js:198:13)
at ChildProcess.cp.emit (D:\Study\Blog\node_modules\cross-spawn\lib\enoent.js:40:29)
at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12)

When this occurs, usually you just need to deploy it again in good internet condition. This is just your internet doesn’t work well, at least for me always.

Law of Large Numbers

第五章 大数定律和中心极限定理

一、*大数定律

(1)切比雪夫不等式

​ $X$有数学期望$E(X)=\mu,D(X=\sigma^2)$, 则对任意正整数$\varepsilon$

​ $P{\left| x - \mu \right| \geq \varepsilon } \leq \frac{\sigma ^2}{\varepsilon ^ 2}$

​ $P{\left| x - \mu \right| < \varepsilon } \geq 1-\frac{\sigma ^2}{\varepsilon ^ 2}$

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