随机变量
服从正态分布
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dceb8e8720b85abc9991b7c9471225d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c5b2d6787ab24ea3f8314a073f4277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bb6cc29f63f4587dbe6dfd83b25192.png)
A.0.66 | B.0.34 | C.0.17 | D.0.16 |
更新时间:2024-05-27 18:45:55
|
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单选题
|
容易
(0.94)
解题方法
【推荐1】若随机变量
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff6b57e84ecad704df6c446927f49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4314bf0e3e975e97c6859dbb0d8aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea800e3d41c00ca9b4e6d94d590fa72.png)
A.0.2 | B.0.3 | C.0.4 | D.0.5 |
您最近一年使用:0次
单选题
|
容易
(0.94)
解题方法
【推荐2】某生态果园盛产猕猴桃,现摘取了1600个果子进行个头大小的取样调查,已知样本果实的果径(单位:cm)服从正态分布
,若果径在
到
之间的果子占样本总数的
,则样本中果径不小于
的猕猴桃数目约为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41993fbb039270d0e5e0ded46f9c2e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
A.40 | B.120 | C.200 | D.240 |
您最近一年使用:0次