解题方法
1 . 已知事件
和事件
互斥,若
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a45dcac87eeb949b409602a95917a.png)
_____________ .
![](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/c87a988f3254a58d5af6045f370a8e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61de2dfe47c840b978cd759e0e6f6071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a45dcac87eeb949b409602a95917a.png)
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解题方法
2 . 已知事件
与
互斥,它们都不发生的概率为
,且
,则
( ).
![](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/d33adb74906403b0b00fcbd9fa691d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001e39aadeca1784891670886b6f2406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a148b8dbf83e71d174e6b068b9567517.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024高二下·上海·专题练习
3 . 下列各式中不能判断事件
与事件
独立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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解题方法
4 . 目前不少网络媒体都引入了虚拟主播,某视频平台引入虚拟主播
,在第一天的直播中有超过
万人次的观看.
(1)已知小李第1天观看了虚拟主播
的直播,若小李前一天观看了虚拟主播
的直播,则当天观看虚拟主播
直播的概率为
,若前一天没有观看虚拟主播
的直播,则当天观看虚拟主播
直播的概率为
,求小李第
天和第
天至少有一天观看虚拟主播直播的概率;
(2)若未来
天内虚拟主播
的直播每天有超过
万人次的观看的概率为
,记这
天中每天有超过
万人次观看的天数为
.
(i)比较
与
的大小,其中
;
(ii)记
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
(1)已知小李第1天观看了虚拟主播
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
(2)若未来
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(i)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13d6cf4e9ee2bf5350bd9906bb950c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641570fc03f56b7b2f0120fec07ba8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6bf1c48ca4bb12e27db554aedea302.png)
(ii)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cebd8ba41e3321eed98fd71c568cf97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21800d1bb5597afa2cc3227ef61ac18.png)
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5 . 一名工人维护甲乙两台机床,在一小时内,甲需维护和乙需维护相互独立,它们的概率分别是
,
,则至少有一台需要维护的概率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29be23f689eb01e57963495377501257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7412fd1be21e4eaf388963a82ac2b11.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 若事件
与
互斥,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dba58df77735e4a9a283dce725833bf.png)
________ .
![](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/033ac0f577666e9e34d7a4fdcbc1e96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd061e199e9d763a2b5857e6f8ada09c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dba58df77735e4a9a283dce725833bf.png)
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7 . 一名信息员维护甲、乙两公司的5G网络,一天内甲公司需要维护和乙公司需要维护相互独立,它们需要维护的概率分别为0.2和0.3,则至少有一个公司不需要维护的概率为_______ .
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8 . 已知事件A与事件B相互独立,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c73c387924cc8d8ff2af8e4ada7ee0.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7cad5ef24e21a82689475d1f75c2165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded5f1e3ff6891cca164ea92ffb1eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c73c387924cc8d8ff2af8e4ada7ee0.png)
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9 . 已知某次摸奖的中奖概率为
,则不中奖的概率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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10 . 10件产品中有8件合格,2件次品,一次取两件产品,其中有次品的概率是______ .
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