表1:男生
等级 | 优秀 | 合格 | 尚待改进 |
频数 | 15 | 5 |
等级 | 优秀 | 合格 | 尚待改进 |
频数 | 15 | 3 |
(2)由表中统计数据填写下边2×2列联表,并判断是否有90%的把握认为“测评结果优秀与性别有关”.
男生 | 女生 | 总计 | |
优秀 | |||
非优秀 | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d67c3ab70fc7d2f19567e0994afa20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
临界值表:
甲校:
分组 | [70, 80) | [80, 90) | [90, 100) | [100, 110) |
频数 | 2 | 3 | 10 | 15 |
分组 | [110, 120) | [120, 130) | [130, 140) | [140, 150] |
频数 | 15 | x | 3 | 1 |
分组 | [70, 80) | [80, 90) | [90, 100) | [100, 110) |
频数 | 1 | 2 | 9 | 8 |
分组 | [110, 120) | [120, 130) | [130, 140) | [140, 150] |
频数 | 10 | 10 | y | 3 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
(2)若规定考试成绩在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852dcf22d7b1476085afefd25960cd79.png)
(3)若规定考试成绩在[120,150]内为优秀,由以上统计数据填写右面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
优秀 | 甲校 | 乙校 | 总计 |
非优秀 | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c08c0a77ffb2a53d687d5f32da9f523.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572673127374848/1572673133412352/STEM/73d75a0a0c99438395da53af14afcc12.png)
女生运动时间统计:
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572673127374848/1572673133412352/STEM/026fd6f5584e4189867e1ace3244c29e.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
(2)若每周运动时间不低于6小时的同学称为“运动爱好者”,每周运动时间低于6小时的同学称为“非运动爱好者”,根据以上统计数据填写下面的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9119ded3b78b3c0bd24e79cb72eeab0a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572673127374848/1572673133412352/STEM/ef6d1093ec3e4ffd91ce7092d7e572b0.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572673127374848/1572673133412352/STEM/303645cfd2044cecb975ef999ebcd114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.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/ce5800c8e65f08cc3a64f063d78d7b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4003d9d60251762e54f43c3257ad08a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f7530034abc91d11bc847602eaf5bc.png)
(Ⅰ)计算青年人(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5800c8e65f08cc3a64f063d78d7b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4003d9d60251762e54f43c3257ad08a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9119ded3b78b3c0bd24e79cb72eeab0a.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572963060310016/1572963066880000/STEM/fca95862838f40deaf5a50f28e663e3a.png)
(Ⅱ)根据(Ⅰ)中的数据,利用独立性检验的方法判断是否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b30b9e17c6e6f609dc4b6f6f8c7ecfa.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d01ccf299e7f7417cf04642ea5c1a0b.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572963060310016/1572963066880000/STEM/e183480f6dc740a5a304450d498181b1.png)
(Ⅲ)从该市微信用户中任意选取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e140d2c111eff3d4e0524a47285b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e140d2c111eff3d4e0524a47285b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d9d0d66a7f8fc34082cf8c45f64839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
(2)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随机抽样,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/b38cfee12dbeeab57c707dca8643538a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![]() | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/14/da29901d-44e5-499d-bc3d-e11865176187.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/14/cdcf8944-889b-4332-a4b4-038c3c1e12fd.png?resizew=319)
(1)求这500名学生中获得专业三等奖学金的人数.
(2)若将每周课外平均学习时间超过35h的学生称为“努力型”学生,否则称为“非努力型”学生,画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
(3)若以频率作为概率,从该校任选1名学生,记该学生2022年获得的专业奖学金的金额为随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附表:
0.050 | 0.010 | 0.005 | 0.001 | |
3.841 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dc70b5e1ba847b9918a50f67bfbe8f.png)
表1单位:人
性别 | 种类 | 合计 | |
A饮品 | B饮品 | ||
女性 | 60 | 40 | 100 |
男性 | 40 | 60 | 100 |
合计 | 100 | 100 | 200 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/d8ff905f-0bca-4ccf-9548-7febde050727.png?resizew=311)
(2)店主进一步调查发现:女性消费者若前一次选择A饮品,则下一次选择A、B两种饮品的概率分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
0.050 | 0.010 | 0.001 | |
3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2ed37f0cdc16ad5ace82e27aac61d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3bfd5b3726ef5f86c2b42bc9adf2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d3f7436a6a15919c5c78d94b4d33b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95af39667e038390752a04b5a1d1f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de02738a022fd24a96a632827ec92c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46abd29c02ff6dec5aa66a7a9a2d0d56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/8f5b7add-3718-479a-a09b-45b83c042334.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/e53b9095-b418-4e23-a448-49946ef495c2.png?resizew=205)
(1)完成下面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
成绩不小于130分 | 成绩小于130分 | 合计 | |
甲班 | |||
乙班 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c22caa94be802e8dd394efbfa8b4e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/908739de8cc4dc4a803dfca92381f9ae.png)
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 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.204 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1720e1256b8eb4fa308d77814edaf197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627a86a6ccc6968f95c9e26db5c4b80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8826cd3a88388c3896b1e429fabd437f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58d9a123e465dace224231f54ee94e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a40cf767fd2a684f2f1ed9216836792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a0dc3b0349c53d7bf36dfe97958cea.png)
(2)在抽取的100名学生中,规定:竞赛成绩不低于80分为“优秀”,竞赛成绩低于80分为“非优秀”.
①请将下面的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
②求出等高条形图需要的数据,并画出等高条形图(按图中“优秀”和“非优秀”所对应阴影线画),利用条形图判断竞赛成绩优秀与性别是否有关系?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
优秀 | 非优秀 | 合计 | |
男生 | 10 | ||
女生 | 50 | ||
合计 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75897df524efc0c2994186583af4270a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6feaa6f046046d349377492faf887e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba0c937e25a940194786c4642e459c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e34d4dc71fe2e518b435aa2029380a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5978fb60a59b0bee67480dfc7544a087.png)
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716798917558272/2718772220387328/STEM/96d494cb-42d1-4de2-aa59-8c0aaae7c75f.png?resizew=366)
(1)求这些学生中成绩优秀的人数;
(2)已知这
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
成绩“优秀” | 成绩“非优秀” | 总计 | |
男生 | |||
女生 | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.050 | 0.025 | 0.010 | 0.001 | |
3.841 | 5.024 | 6.635 | 10.828 |