已知随机变量且,则参数值是( )。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/371bed96f54d4512843ecd38aee0c0fd.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
- 若随机变量, 且则二维随机变量服从二维正态分布。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/06902c8739054c2686716051f5d8b3fd.png
- x=0是的( )https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/7bf81bd79b3b46eb957c2f17d30c395a.png
- 设函数,则x=0是的( )https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/ad3e899cd2ee4898a97bfad0fc668313.png