I’ve met a new problem recently: I switched into Linux but my Blog folder is under my mechanical hard disk. I want my Blog folder available to be achieved by command not manually. So to make this come true, I learned a word mount. By using mount, you can use my blog folder by command. There are three steps:
Recently, I’ve met a problem like this when I deploying my blog. hexo d gets error.
For the biggest, only if there is one person who answer the wrong can he go through the most questions. So the longest time he can go through, the largest sum of money he can get.
In the first example test case, the nearest floor with an open restaurant would be the floor 4.
Here are some sorting ways and I use many data to test and compare. Just to illustrate the property of each algorithm.
So the value of b should only be 9,99,999...(each digit is consists of 9)
First of all I tried the violent way. Time limit exceeded. So I tried mathematic way.
第六章 数理统计的基本概念
（1）总体与个体
a. 一批灯泡的全体组成一个总体，其中每一个灯泡都是一个个体。
b. 一个随机变量X或其相应的分布函数$F(x)$成为一个总体。
第五章 大数定律和中心极限定理
（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$\varepsilon$
$P{\left| x - \mu \right| \geq \varepsilon } \leq \frac{\sigma ^2}{\varepsilon ^ 2}$
$P\{\left| x - \mu \right| < \varepsilon \} \geq 1-\frac{\sigma ^2}{\varepsilon ^ 2}$
第四章 随机变量的数字特征
离散型
$$
E(X)=\sum_{k=1}^{\infty} x_{k} p_{k}
$$
当上式发散时，$X$的数学期望不存在。