解题方法
1 . 《互联网用户账号信息管理规定》已于2022年8月1日起施行,显示
属地成常态.现有新浪微博、今日头条、抖音、微信、小红书这五个互联网平台的
属地号码各一个,若从中任选两个
属地号码,则恰好抖音
属地号码被选中的概率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d695ebe5453706a9b8c909803553e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d695ebe5453706a9b8c909803553e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d695ebe5453706a9b8c909803553e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d695ebe5453706a9b8c909803553e5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
2 . 某校在某次考试后,为了解高二年级整体的数学成绩,对高二年级学生的数学成绩进行了抽样调查,抽取了一个容量为50的样本,将调查数据整理成如下频率分布直方图,分段区间为
,
,
,
(单位:分).
(2)用样本估计总体,以频率作为概率,在高二年级中随机抽取一名同学的数学成绩,若不低于130分称为优秀,求该同学成绩优秀的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8c2a91a15e1f7b296b64d3bd2e7551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4f8425b95d46c6b096aff302de7de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495f2ec132a5ce5dc4080a56f16ecaad.png)
(2)用样本估计总体,以频率作为概率,在高二年级中随机抽取一名同学的数学成绩,若不低于130分称为优秀,求该同学成绩优秀的概率.
您最近一年使用:0次
2023-09-30更新
|
281次组卷
|
2卷引用:河南省青桐鸣2023-2024学年高二上学期9月大联考数学试题
解题方法
3 . 哥德巴赫猜想的部分内容如下:任一大于
的偶数可以表示为两个素数(素数是在大于
的自然数中,除了
和它本身以外不再有其他因数的自然数)之和,如
.在不超过
的素数中,随机选取两个不同的数,其和等于
的概率是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526f19ca6f22de4e6b13a8a159b04d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
您最近一年使用:0次
解题方法
4 . 某中学为了解大数据提供的个性化作业质量情况,随机访问50名学生,根据这50名学生对个性化作业的评分,绘制频率分布直方图(如图所示),其中样本数据分组区间[40,50)、[50,60)、…、[80,90)、[90,100].
(2)从评分在[40,60)的受访学生中,随机抽取2人,求此2人评分都在[50,60)的概率;
(2)从评分在[40,60)的受访学生中,随机抽取2人,求此2人评分都在[50,60)的概率;
您最近一年使用:0次
2022-09-19更新
|
558次组卷
|
3卷引用:内蒙古巴彦淖尔市衡越实验中学2022-2023学年高二上学期一诊考试理科数学试卷
解题方法
5 . 皮埃尔·德·费马,法国律师和业余数学家,被誉为“业余数学家之王”,对数学界做出了重大贡献,其中在1636年发现了:若p是质数,且a,p互质,那么a的
次方除以p的余数恒等于1,后来人们称该定理为费马小定理,依此定理若在数集
中任取两个数,以其中一个作为p,另一个作为a,则所取两个数不符合费马小定理的概率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164b2b3efdcaabfa22423e9e62887a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8baf1c1f5d8ea421b03dd173242d7b47.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
6 . 某购物网站为优化营销策略,从某天在该网站进行网购消费且消费金额不超过1000元的网购者中随机抽取100人进行调查,根据调查数据,按消费金额分成
,
,
,
,
五组,得到的频率分布直方图如图所示.已知样本中网购者的平均消费金额是568元(同一组中的每个数据用该组区间的中点值代替).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/759d6377-b468-4ca3-906f-1af8bed1e166.png?resizew=301)
(1)求频率分布直方图中的x,y的值;
(2)若从消费金额少于400元的网购者中采用分层抽样法随机抽取6人,再从这6人中随机抽取2人,求这2人的消费金额都在
内的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e62569ecc43420d1e8142045adce99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029c237ac5a522c7024788c2fa0064f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cecafae34ef53eb231cfd1f6da0c23d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a434cef9dd13eb4311b7f0eb11011b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5fe390f75f4baf17bfae1451fecbe9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/759d6377-b468-4ca3-906f-1af8bed1e166.png?resizew=301)
(1)求频率分布直方图中的x,y的值;
(2)若从消费金额少于400元的网购者中采用分层抽样法随机抽取6人,再从这6人中随机抽取2人,求这2人的消费金额都在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029c237ac5a522c7024788c2fa0064f3.png)
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2021-01-16更新
|
171次组卷
|
3卷引用:贵阳省为明国际学校2020-2021学年高二上学期联合考试数学试题
解题方法
7 . 一次性从装有3个红球,2个白球的盒子中随机抽取2个球,则抽取的2个球全是红球的概率是( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-01-16更新
|
159次组卷
|
2卷引用:贵阳省为明国际学校2020-2021学年高二上学期联合考试数学试题
解题方法
8 . 某超市举办购物抽奖的促销活动,规定每位顾客购物满100元,可参与一次抽奖,抽奖规则满足抽奖要求的顾客从有编号为1、2、3、4的四个小球(除数字不同外,其他完全相同)的抽奖箱中取球,每次取出一个小球记下球上的数字后放回,连续取两次,若取出的两个小球的数字之和为8,则中特等奖:取出的两个小球的数字之和为7,则中一等奖;取出的两个球的数字之和为6,则中二等奖;取出的两个小球的数字之和为5,则中三等奖,其他情况不中奖.
(1)求某顾客抽奖一次,中二等奖的概率;
(2)求某顾客抽奖一次,中奖的概率.
(1)求某顾客抽奖一次,中二等奖的概率;
(2)求某顾客抽奖一次,中奖的概率.
您最近一年使用:0次
2020-12-03更新
|
394次组卷
|
3卷引用:贵阳省为明国际学校2020-2021学年高二上学期联合考试数学试题
解题方法
9 . 某校高三文科
名学生参加了
月的模拟考试,学校为了了解高三文科学生的数学、外语成绩情况,利用随机数表法从中抽取
名学生的成绩进行统计分析,将学生编号为
、
、
、…
.
(1)若从第
行第
列的数开始右读,请你依次写出最先抽出的
人的编号(下面是摘自随机数表的第
行至第
行);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332e71982612ea86c28b9f2054b1045c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
(2)抽出的
名学生的数学、外语成绩如表:
若数学成绩优秀率为
,求
、
的值;
(3)在外语成绩为良的学生中,已知
,
,求数学成绩优比良的人数少的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ac61206cb12cf6686bb0facf635010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaa0075974b212da879fc120bc2c905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d07d9fb36737fc9b146e9f01cda6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743fd33ecc8942e84567f7c34f342d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a668e9d0a907e7fc10e63f1b48283e9b.png)
(1)若从第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b36fb43923326b42462c2b53c52c372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fd1dadbe1b2cafc0cf8b5bb8b18ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9ba3f640f57c0cece089dfd19b4970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c696d722e1b4b938c7a956ff83f733bd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e398a06d8ffa9071cf32c3e9e73a1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e3026c4e35dbfedd67de36f122bf5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92128c6c226ce688bc160fb86854f2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a8c7954d594263b44e2879ab6b33a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef0a9f421547e737ec464d29b314403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4500d4031cbf22a456fa09fa393ba2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13331651b4e0d36a2f3a32b4d1a767e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc06849d2a73578c134e6065ab5a9586.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1834490aacbee800ed5721312f4be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
(2)抽出的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
外语 | ||||
优 | 良 | 及格 | ||
数学 | 优 | |||
良 | ||||
及格 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17bd08132eeddb7c025b9440cc578454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)在外语成绩为良的学生中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cc5cefb387d87f3803a5814394e2b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fb80d6cd5e7a523ecffed2935692a9.png)
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2021-04-02更新
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587次组卷
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6卷引用:四川省乐山四校2017-2018学年高二第二学期半期联考数学理试题
四川省乐山四校2017-2018学年高二第二学期半期联考数学理试题四川省乐山四校2017-2018学年高二第二学期半期联考数学文试题(已下线)专题54 统计与概率(同步练习)-2021年高考一轮数学(文)单元复习一遍过(已下线)黄金卷08-【赢在高考·黄金20卷】备战2021年高考数学(文)全真模拟卷(新课标Ⅱ卷)(已下线)押第19题 概率统计-备战2021年高考数学(文)临考题号押题(全国卷1)(已下线)专题10.1 概率 章末检测1(易)-【满分计划】2021-2022学年高一数学阶段性复习测试卷(人教A版2019必修第二册)
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10 . 在人群流量较大的街道,有一中年人吆喝“送钱”,只见他手拿一黑色小布袋,袋中有2只红色、2只黄色、2只白色的乒乓球(其体积、质地完成相同),旁边立着一块小黑板写道:摸球方法:从袋中随机摸出3个球,若摸得3个球的颜色都不相同,摊主送给摸球者5元钱;否则摸球者付给摊主4元钱.
(1)摸出的3个球颜色各不相同的概率是多少?
(2)假定一天中有500人次摸奖,试从概率的角度估算一下这个摊主一天能赚多少钱?
(1)摸出的3个球颜色各不相同的概率是多少?
(2)假定一天中有500人次摸奖,试从概率的角度估算一下这个摊主一天能赚多少钱?
您最近一年使用:0次