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                            ##一、二維隨機變量
#### 二維隨機變量
```[math]
E(X,Y)=(EX,EY)
```
```[math]
E(X) =  \sum_{i=1}^{+\infin}x_ip_i = \sum_{i=1}^{+\infin}\sum_{j=1}^{+\infin}x_ip_{ij}
```
#### 二維隨機變量的聯合分布函數及其性質
#### 二維離散型隨機變量的聯合分布律及其性質
#### 二維連續型隨機變量的聯合概率密度及其性質
## 二、n維隨機變量
#### n維隨機變量
#### n維隨機變量的聯合分布函數

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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