解题方法
1 . 随机变量X服从正态分布,有下列四个命题:
①
;②
;
③
;④
.
若只有一个假命题,则该假命题是( )
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f86b1093148d5f0263fbd96fe0dddee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03e0c2dc0b7cfd9c40d1ccff37ad2d4.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e354e2ad9dfaf5ee561394a96e7ee26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e2131181d256ef81f5f39a8a42e7b1.png)
若只有一个假命题,则该假命题是( )
A.① | B.② | C.③ | D.④ |
您最近一年使用:0次
2 . 下列说法中正确的是( )
①不等式
的解集是
;
②命题“
,
”的否定是“
,
”;
③已知随机变量
服从正态分布
且
,则
.
①不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c122e40fff89f6dcfba6fe0f3c9867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943448780f2e5c808901c33f3ff6eeff.png)
②命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e873528ea9b742780217c76c96f8dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4550a3aac23c2c939bb55396275856.png)
③已知随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778dfb406e5ca6131f7e39a1cdf145c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a307cf1bf1fa44a643d7154897c081d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b06084e691e1040ff47ebba8d63f0515.png)
A.②③ | B.①② | C.③④ | D.①②③ |
您最近一年使用:0次