A班:
分组 | ![]() | ![]() | ![]() | ![]() | ![]() | 100分以下 |
频数 | 4 | 8 | 10 | 12 | 12 | 4 |
分组 | ![]() | ![]() | ![]() | ![]() | ![]() | 100分以下 |
频数 | 6 | 12 | 14 | 10 | 6 | 2 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
A班 | B班 | 总计 | |
优秀 | |||
不优秀 | |||
总计 |
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
α | 0.1 | 0.05 | 0.025 | 0.01 |
![]() | 2.706 | 3.841 | 5.024 | 6.635 |
月份 | 1 | 2 | 3 | 4 | 5 |
带货金额 | 350 | 440 | 580 | 700 | 880 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(2)求变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)该公司随机抽取55人进行问卷调查,得到如下不完整的列联表:
参加过直播带货 | 未参加过直播带货 | 总计 | |
女性 | 25 | 30 | |
男性 | 10 | ||
总计 |
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d578c9e7cf1c6a92c0cc28f7f91459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b329efddd8bbdbd3e1751b2e2936b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9652d385c0442c3c9d276273436c4bde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73de2b07f9ea523577727e8be46710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde4f00e86e0791aa784801624be9d3d.png)
参考公式:相关系数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368976f08508d324aa73ec6a9ceca54f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2606e1508b23243588e79d56517f3161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8112f4d3ab5f8ec8405fe32fd181ce32.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.15 | 0.10 | 0.05 | 0.025 | |
2.072 | 2.706 | 3.841 | 5.024 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb3d99cbd744a9d742ea44c620784d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318526d0ebdb8f02a91b3903e48b42b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e8b4e1a5ec3b13973d8ed247d34a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049308ddadf8b2b49224a8eb8555a3ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac868aff0466375197c91b13b73eee2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/426a594e-d96e-46d4-a4ac-cef5622f986c.png?resizew=208)
试验发现志愿者体内产生抗体的共有160人,其中该项指标值不小于60的有110人.假设志愿者注射疫苗后是否产生抗体相互独立.
(1)填写下面的2×2列联表,并根据列联表及小概率值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
抗体 | 指标值 | 合计 | |
小于60 | 不小于60 | ||
有抗体 | |||
没有抗体 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(i)用频率估计概率,已知一名志愿者注射2次疫苗后产生抗体的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47938ad49863a8ff60ea48d0820e48f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(ⅱ)以(i)中的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef133b0fd53a48310a82c18729575abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.50 | 0.40 | 0.25 | 0.15 | 0.100 | 0.050 | 0.025 |
![]() | 0.455 | 0.708 | 1.323 | 2.072 | 2.706 | 3.841 | 5.024 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a585bc9eaab00bd855b84371942aae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb3d99cbd744a9d742ea44c620784d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318526d0ebdb8f02a91b3903e48b42b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e8b4e1a5ec3b13973d8ed247d34a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049308ddadf8b2b49224a8eb8555a3ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac868aff0466375197c91b13b73eee2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/ccba7514-74e8-4720-b609-87b18e70d271.png?resizew=206)
(1)求这200人测试成绩的中位数和平均数的估计值;(同一区间的数据用该区间中点值作代表)
(2)填写下面的2×2列联表,判断是否有95%的把握认为高中数学学习中抽象思维与性别有关.
成绩小于60 | 成绩不小于60 | 合计 | |
男 | |||
女 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![]() | 0.10 | 0.050 | 0.010 |
k | 2.706 | 3.841 | 6.635 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/aa088a4729226b696c536845791d4c02.png)
![]() | 2 | 5 | 8 | 9 | 11 |
![]() | 12 | 10 | 8 | 8 | 7 |
![](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/644a7a82d8e238066fc4590deb7ebda1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)填写下列2×2列联表,并判断是否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8377d2ebe1a3ee5700d26f15e8081c7d.png)
销量低于![]() | 销量不低于![]() | 合计 | |
气温高于![]() | |||
气温不高于![]() | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012c89339095ae0d325a576126cb97c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.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 |
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 |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/fe349482-c8d4-4bc4-b4a6-b495730f08b3.png?resizew=564)
(1)求新养殖法的频率分布直方图中小矩形高度x的值:
(2)根据频率分布直方图,填写下面列联表,并根据小概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
养殖法 | 箱产量 | 合计 | |
箱产量<50![]() | 箱产量![]() ![]() | ||
旧养殖法 | |||
新养殖法 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056d757211905c5129de634daa744856.png)
足球爱好者 | 非足球爱好者 | 合计 | |
女 | 20 | 50 | |
男 | 15 | ||
合计 | 100 |
(2)现从抽取的女性人群中,按“足球爱好者”和“非足球爱好者”这两种类型进行分层抽样抽取5人,然后再从这5人中随机选出3人,求其中至少有1人是“足球爱好者”的概率.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
平均每天刷抖音的时长 | 不大于1小时 | 大于1小时且小于3小时 | 不少于3小时 |
人数(男) | 20 | 25 | 6 |
人数(女) | 20 | 15 | 14 |
(1)根据调查数据,填写下面列联表,并根据数据判断是否有95%的把握认为性别与是否为“重度沉迷”刷抖音有关系?
非“重度沉迷” | “重度沉迷” | 合计 | |
人数(男) | |||
人数(女) | |||
合计 |
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |