已知随机变量的方差存在，且满足不等式则一定有（）。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/c19400d889b844f3b4e8c6e30240cbc0.png
举一反三
- 已知极限则a=0,b=6（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/b97eda7869144de1b30a6b2cb3e0fdfc.png
- 已知随机变量且，则参数值是（ ）。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/371bed96f54d4512843ecd38aee0c0fd.png
- 已知随机变量的方差存在，且满足不等式则一定有（）。https://image.z...b4e8c6e30240cbc0.png
- 若随机变量X,Y满足，则。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/a0b66ace257a4e1a93e06690c8f2047d.png
- 设随机变量X,Y的方差存在且不等于0，若有，则X,Y不相关。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/1c7eba9af979438fae6e4f34405387f0.png