解题方法
1 . 设随机变量
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18bbc7cc63df92f3f1c11effd55f282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6962835c9ba59f18126689122806a738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-07-16更新
|
399次组卷
|
2卷引用:江苏省连云港市2022-2023学年高二下学期期末数学试题
2 . 某校为了研究学生的性别和对待某一活动的态度(支持与不支持)的关系,运用
列联表进行独立性检验.整理所得数据后发现,若依据
的独立性检验,则认为学生性别与是否支持该活动无关;若依据
的独立性检验,则认为学生性别与是否支持该活动有关,则
的值可能为( )
附表:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93f43c77e96f7f0cc838495752f9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793afd75d2b29a7bd118aae3294293c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953e89f7e797bf8fe9ff31e0d2f66728.png)
附表:
![]() | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![]() | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
A.4.238 | B.4.972 | C.6.687 | D.6.069 |
您最近一年使用:0次
3 .
的展开式中
的系数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a105e194292168f1afc7621cd0b177b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.560 | B.![]() | C.280 | D.![]() |
您最近一年使用:0次
4 . 已知某地有
,
,
三个4A景区,小华计划暑假至少去其中一个景区游玩,则不同的游玩方案(不考虑游玩顺序)有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.3种 | B.4种 | C.7种 | D.9种 |
您最近一年使用:0次
解题方法
5 . 已知随机变量服
从正态分布
,且
,则
( )
![](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/c8946dd1e1571369955d2f26ab7dbe08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39edd312e72f4710ae674fce295edf6e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 抛掷一颗质地均匀的骰子,样本空间
,事件
,事件
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2dfce786f105ce1d13d1f0c72ebf2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed0081de4e04574dd0884c4e6077fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d522efd2e962d0979937c9fe6fae7400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc0962fdceeba03094d20a001b73db1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-07-16更新
|
619次组卷
|
3卷引用:江苏省连云港市2022-2023学年高二下学期期末数学试题
7 . 设随机变起
的分布列为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2da212167a5ea52441f16b5143229c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a718711dbafa4f35c5a32ab62bbd83a1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e605aeb71bcb9d7cd2fb7f84fd01def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e022610249fccb9f2573f177409ddc.png)
A.30 | B.20 | C.35 | D.21 |
您最近一年使用:0次
解题方法
9 . 设随机变量
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a3bc0f34bd55c43cf3bbb6bff4f9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a319c62559b34e017339e4029604990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbcba90335d72d35d05045c809a3850.png)
A.0.2 | B.0.3 | C.0.6 | D.0.7 |
您最近一年使用:0次
10 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb8f7374bb89c56dd94e2f4d743fc1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a45dcac87eeb949b409602a95917a.png)
A.0.75 | B.0.6 | C.0.48 | D.0.2 |
您最近一年使用:0次