某射手每次射击击中目标的概率固定,他准备进行
(
)次射击,设击中目标的次数记为
,已知
且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72ab86713ccc831bc2c5b71905b7a50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da432e9e82068cb5745ed6017692dd62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc23dc1709498e8920d7d243213190b2.png)
A.![]() | B.![]() | C.1 | D.2 |
更新时间:2021-08-22 13:26:58
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【推荐1】在信道内传输0,1信号,信号的传输相互独立.发送0时,收到1的概率为
,收到0的概率为
;发送1时,收到0的概率为
,收到1的概率为
.考虑两种传输方案:单次传输和三次传输.单次传输是指每个信号只发送1次,三次传输是指每个信号重复发送3次.收到的信号需要译码,译码规则如下:单次传输时,收到的信号即为译码;三次传输时,收到的信号中出现次数多的即为译码(例如,若依次收到1,0,1,则译码为1)下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e2034f7ecbb1eed26f22181fb5501b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fc97b0acc21bf52197d5a1e793671a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5544d98eaae4004ed8735f09623d05a3.png)
A.采用单次传输方案,若依次发送1,0,1,则依次收到1,0,1的概率为![]() |
B.采用三次传输方案,若发送1,则依次收到1,0,1的概率为![]() |
C.采用三次传输方案,若发送1,则译码为1的概率为![]() |
D.当![]() |
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【推荐2】下列命题中,正确的是( )
① 若随机变量
,则
且
;
② 命题“
”的否定是:“
”;
③ 命题 “若
,则
或
”为真命题;
④ 已知
为实数,直线
则“
”是 “
” 的充要条件.
① 若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175ba34e8a37e476383cf0ebf7937217.png)
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② 命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea683b6cc2574d5f186753f143cfe679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980549147925380dbf3cfd13752b3c3f.png)
③ 命题 “若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c53b55ba737cff86bb570064a2f78273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc91d92eb161e54def20b039d2089201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6bf11627fab19c56c349e75b2c72889.png)
④ 已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed586dbd19850e249d937e5fe8b246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1095c036b49c3327baaa2c3c7f746134.png)
A.①② | B.②③ | C.②④ | D.③④ |
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【推荐1】下列说法中正确的是( )
A.“![]() ![]() ![]() ![]() |
B.已知随机变量![]() ![]() ![]() |
C.已知随机变量![]() ![]() ![]() ![]() |
D.已知随机变量![]() ![]() ![]() |
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【推荐2】若X~B(n,p),且E(X)=6,D(X)=3,则P(X=1)的值为( )
A.3×2-2 | B.2-4 | C.3×2-10 | D.2-8 |
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【推荐1】已知离散型随机变量
服从二项分布
,且
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知随机变量
,且
,则
( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72d6c899d9ece423f5db1f2f529d16b.png)
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A.3 | B.6 | C.12 | D.24 |
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