语文成绩 | 合计 | |||
优秀 | 不优秀 | |||
数学 成绩 | 优秀 | 50 | 30 | 80 |
不优秀 | 40 | 80 | 120 | |
合计 | 90 | 110 | 200 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93f43c77e96f7f0cc838495752f9363.png)
(2)在人工智能中常用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2adaf7f84a5e8d95c176197fc69fd04d.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50baacc976f8b66c6c12ec167bbf774e.png)
(3)现从数学成绩优秀的样本中,按分层抽样的方法选出8人组成一个小组,从抽取的8人里再随机抽取3人参加数学竞赛,求这3人中,语文成绩优秀的人数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
优秀 | 良好 | 及格 | 不及格 | |
男生 | 100 | 200 | 780 | 120 |
女生 | 120 | 200 | 520 | 120 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
达标 | 不达标 | 合计 | |
男生 | |||
女生 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
0.050 | 0.010 | 0.001 | |
3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7c2d555a902d61af99298c5c29e42f.png)
阅读时间 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
人数 | 10 | 12 | 14 | 20 | 24 | 14 | 6 |
(1)请根据已知条件完成以下
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bf15e9d132bf3ae257c1741654f0c7.png)
非阅读达人 | 阅读达人 | 合计 | |
男生 | |||
女生 | 12 | 40 | |
合计 |
附表:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8ec200973736ac8bcd9aa633855d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
单位:人
性别 | 体重 | 合计 | |
超过55kg | 不超过55kg | ||
男 | 180 | 120 | 300 |
女 | 90 | 110 | 200 |
合计 | 270 | 230 | 500 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
(2)按性别采用分层随机抽样的方式在该中学高三年级体重超过55kg的学生中抽取9人,再从这9人中任意选取3人,记选中的女生数为X,求X的分布列与期望.
参考公式和数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
0.1 | 0.05 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)请根据以上信息完成2×2列联表,并根据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255cd2084765f7019367ff6e575b9d6.png)
性别 | 垃圾处理 | 合计 | |
不分类 | 分类 | ||
男性 | |||
女性 | |||
合计 |
周次 | 1 | 2 | 3 | 4 | 5 |
对垃圾不分类处理的人数 | 120 | 105 | 100 | 95 | 80 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.10 | 0.05 | 0.010 | 0.005 | 0.001 |
![]() | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec3e81360188a9110499bbe41073724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8112f4d3ab5f8ec8405fe32fd181ce32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a247cf0f5fb1400088dac60901e3a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3586cd74bbbbfba3c34a2744d4c0ebd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6a48bec68cb6989b5229d716bf02f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b230c5e6933679768f2fb59c03a61a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3052eeda61923c2c0f492ba3150cd811.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/a27c20a3-8b13-452b-aacd-efa0e9857fc5.png?resizew=256)
(1)求a的值并估计这160人的平均年龄(每组数据以区间中点值作为代表);
(2)把年龄在第1,2,3组的居民称为青少年组,年龄在第4,5组的居民称为中老年组,选出的200人中通过“银联闪付APP”成功领取“欢乐购”消费券的中老年人有26人,完成下列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
通过银联闪付APP成功领券 | 通过“汕头商务”公众号“促消费”菜单成功领券 | 合计 | |
青少年 | |||
中老年 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/353f9ac2632b47de33964839b460e77c.png)
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
(1)请根据提议完成下面的2×2列联表
经常锻炼 | 不经常锻炼 | 合计 | |
男生 | |||
女生 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
附:
![]() | 0.10 | 0.05 | 0.010 | 0.005 | 0.001 |
![]() | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a6d141688731d46a6ef75b1d438534.png)
(1)请补全
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
课间不经常进行体育活动 | 课间经常进行体育活动 | 合计 | |
男 | |||
女 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附表:
0. 1 | 0. 05 | 0. 01 | 0. 005 | 0. 001 | |
2. 706 | 3. 841 | 6. 635 | 7. 879 | 10. 828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.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/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
药物 | 疾病 | 合计 | |
未患病 | 患病 | ||
未服用 | |||
服用 | |||
合计 |
(2)依据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
(表一)
使用情况 | Y | N |
人数 | 270 | 130 |
高一学生 | 高二学生 | 合计 | |
Y | 150 | ||
N | 80 | ||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
(2)用样本估计总体,将频率视为概率,在该地区高一学生和高二学生中各随机抽取4人,记事件A为“4名高一学生中恰有3人喜欢‘云课堂’”,事件B为“4名高二学生中恰有3人喜欢‘云课堂’”根据所给数据,估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b6f8cb2faaad82b53b2a66ee817a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ab49f370919e730e3567070deee65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b6f8cb2faaad82b53b2a66ee817a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ab49f370919e730e3567070deee65.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
0.05 | 0.01 | 0.001 | |
3.841 | 6.635 | 10.828 |