(1)依据调查数据完成如下列联表,根据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
游客 | 短视频 | 合计 | |
收看 | 未看 | ||
南方游客 | |||
北方游客 | |||
合计 |
(i)求经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
(ii)记前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb95a9c95da5e03d680ac7bc601120c0.png)
附表:
![]() | 0.1 | 0.05 | 0.01 | 0.005 | 0.001 |
![]() | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
网民类型 | 在直播间购买大米的情况 | 合计 | |
在甲直播间购买 | 在乙直播间购买 | ||
本地区网民 | 50 | 5 | 55 |
外地区网民 | 30 | 15 | 45 |
合计 | 80 | 20 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255cd2084765f7019367ff6e575b9d6.png)
(2)用样本分布的频率分布估计总体分布的概率,若共有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac44e6d2286d0cb37036706f8d9f900c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875a413a7593078159ceda1319f965cd.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.1 | 0.05 | 0.01 | 0.005 |
![]() | 2.706 | 3.841 | 6.635 | 7.879 |
性别 | 速度 | 合计 | |
快 | 慢 | ||
男生 | 65 | ||
女生 | 55 | ||
合计 | 110 | 200 |
(2)现有n
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5e07bf129b073f37b553fbca100172.png)
(i)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
(ii)求证:这n根绳子恰好能围成一个圈的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f34a85a61fcc926833ed2775f376541.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c1698cf3a31568a8ff6f6d4ee280e8.png)
0.100 | 0.050 | 0.025 | 0.010 | |
k | 2.706 | 3.841 | 5.024 | 6.635 |
喜爱阅读 | 不喜爱阅读 | 共计 | |
女生 | 45 | 50 | |
男生 | 15 | ||
共计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bf15e9d132bf3ae257c1741654f0c7.png)
(2)现进行一项阅读答题测试,测试规则:若该同学连续三次答对,则测试通过,答题结束;若出现连续两次答错,则未通过测试,答题结束.其余情况下可以一直答题,直至出现前面两种情况.已知该同学每次答对的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
参考附表:
0.050 | 0.025 | 0.010 | |
3.841 | 5.024 | 6.635 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d9d0d66a7f8fc34082cf8c45f64839.png)
数学成绩优秀 | 数学成绩不优秀 | 合计 | |
经常整理 | |||
不经常整理 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)根据图1、图2中的数据,补全上方
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
(3)用频率估计概率,在全市中学生中按“经常整理错题”与“不经常整理错题”进行分层抽样,随机抽取5名学生,再从这5名学生中随机抽取2人进行座谈.求这2名同学中经常整理错题且数学成绩优秀的人数X的分布列和数学期望.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3599e8452732f75172651d838f31856d.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
6 . 2022年11月20日,卡塔尔足球世界杯正式开幕,世界杯上的中国元素随处可见.从体育场建设到电力保障,从赛场内的裁判到赛场外的吉祥物都是中国制造,为卡塔尔世界杯提供了强有力的支持.国内也再次掀起足球热潮.某地足球协会组建球队参加业余比赛,该足球队教练组为了考查球员甲对球队的贡献,作出如下数据统计(甲参加过的比赛均分出了输赢):
球队输球 | 球队赢球 | 总计 | |
甲参加 | 2 | 30 | 32 |
甲未参加 | 8 | 10 | 18 |
总计 | 10 | 40 | 50 |
(1)根据小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255cd2084765f7019367ff6e575b9d6.png)
(2)从该球队中任选一人,A表示事件“选中的球员参赛”,B表示事件“球队输球”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9dd9ec374dde193b156db6e20e15d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b502b4caafbff9503e4303b72bdfe647.png)
①证明:;
②利用球员甲数据统计,给出,
的估计值,并求出R的估计值.
附:.
参考数据:
a | 0.05 | 0.01 | 0.005 | 0.001 |
3.841 | 6.635 | 7.879 | 10.828 |
下表是2022年卡塔尔世界杯淘汰赛阶段的比赛结果:
淘汰赛 | 比赛结果 | 淘汰赛 | 比赛结果 |
1/8决赛 | 荷兰 | 1/4决赛 | 克罗地亚 |
阿根廷 | 荷兰 | ||
法国 | 摩洛哥 | ||
英格兰 | 英格兰 | ||
日本 | 半决赛 | 阿根廷 | |
巴西 | 法国 | ||
摩洛哥 | 季军赛 | 克罗地亚 | |
葡萄牙 | 决赛 | 阿根廷 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ca63121721f04e5d11d50981b434e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1272772701f275330396cac433ebf6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98801b948916ee309a370d34bf6e2b0.png)
(1)请根据上表估计在世界杯淘汰赛阶段通过点球大战分出胜负的概率.
(2)根据题意填写下面的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
欧洲球队 | 其他球队 | 合计 | |
闯入8强 | |||
未闯入8强 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab4c80aa3d7d480e3b260384edd3e0b.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2648096e6f02304dc2fa9863b4f95b3.png)
0.1 | 0.05 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
性别 | 锻炼 | |
不经常 | 经常 | |
女生 | 40 | 60 |
男生 | 20 | 80 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
(2)从这200人中随机选择1人,已知选到的学生经常参加体育锻炼,求他是男生的概率;
(3)为了提高学生体育锻炼的积极性,集团设置了“学习女排精神,塑造健康体魄”的主题活动,在该活动的某次排球训练课上,甲乙丙三人相互做传球训练,第1次由甲将球传出,每次传球时,传球者都等可能地将球传给另外两个人中的任何一人.求第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![]() | 0.010 | 0.005 | 0.001 |
![]() | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed451d9fb1c1458b6ee6133353c8cedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78096f4ef2913b9e5bc4149cd735cb8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6bf71d482273d65c3b61654a552f86b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)该机构还调查了该地区90位购车车主的性别与购车种类情况,得到的数据如下表:
性别 | 购买非电动汽车 | 购买电动汽车 | 总计 |
男性 | 39 | 6 | 45 |
女性 | 30 | 15 | 45 |
总计 | 69 | 21 | 90 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
(3)在购买电动汽车的车主中按照性别进行分层抽样抽取7人,再从这7人中随机抽取3人,记这3人中,男性的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
①参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fd494e3b77f33f500640520028f2f4.png)
②参考公式:(i)线性回归方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280d98ba415407cd0fbad51131bbf15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0880405010cfbf3ce04a1a7ba4be20b7.png)
(ii)相关系数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ae9421919944d997c304d7711b4b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a63c9b101dd6797948ffa03874c4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(iii)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f503f0dec4cf2cc95ad9521c5eaf9f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() |
患病 | 未患病 | 总计 | |
没服用药 | 20 | 30 | 50 |
服用药 | x | y | 50 |
总计 | M | N | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6057fdf816a06ee78d3c7ae2cb313f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d331f44d3abe46edd970aae917d742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b9a012edc286eced7922049d48427e.png)
(1)求出列联表中数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6057fdf816a06ee78d3c7ae2cb313f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d331f44d3abe46edd970aae917d742.png)
(3)能够以99%的把握认为药物有效吗?
(参考公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145adcc6e0ccce808b2e581bbed99fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b840223f9cd2a238fd3166ec680edd93.png)
P(K2≥k) | 0.10 | 0.05 | 0.010 | 0.001 |
k | 2.706 | 3.841 | 6.635 | 10.828 |