![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d30ac3884e8807aec07aa3d2c14a851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c851d5b6da1f56e74a5aea5cc8fdeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35127d16626724faa9cf50ad5228242e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f7c4a8558eff6427d22b6c0c855721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f28316233c1d0f88cd4bece085b6e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f7c4a8558eff6427d22b6c0c855721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e42a46db8c517259003cdcec6b83967.png)
![](https://img.xkw.com/dksih/QBM/2023/5/8/3233425156571136/3233909931794432/STEM/cbbdb51e502f47a68e4a84dc9eb9c181.png?resizew=399)
(1)该企业员工总数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69c0fc5595aadf8e59662c20c515b58.png)
(2)从该企业身体处于肥胖状态的员工中随机抽取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51a293b9810a569e5240db168296044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
(3)从样本中身高大于或等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62baf91e02d4df0a5409eb11f4542a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f733b1ceeead9ff892539d46a23f3626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
班号 | 1 | 2 | 3 | 4 |
人数 | 30 | 40 | 20 | 10 |
(1)求各班参加竞赛的人数;
(2)2班的小张同学被抽中参加竞赛,若该同学在预设的10个题目中恰有3个答不对,记他答对的题目数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(3)若1班每位参加竞赛的同学答对每个题目的概率均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/4d2543a6-b8b5-4d41-835b-4131e8134be4.png?resizew=435)
假设用频率估计概率,且每位教师对“人工智能助力教学”作用的认识相互独立.
(1)估计该地区中小学教师中认为人工智能对于教学“没有帮助”的人数;
(2)现按性别进行分层抽样,从该地区抽取了5名教师,求这5名教师中恰有1人认为人工智能对于教学“很有帮助”的概率;
(3)对受访教师关于“人工智能助力教学”的观点进行赋分:“没有帮助”记0分,“有一些帮助”记2分,“很有帮助”记4分.统计受访教师的得分,将这100名教师得分的平均值记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e34bde9ce11f753f3e3631fbd0112fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b915ea3069054b7389cee9827dd613c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55ec3fc6a2a218803229a6fe3ab2679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b417b48aa287b9a6896bc9c45d5efc6.png)
营业情况 分行业 | 营业收入单位(亿元) | 营业成本单位(亿元) |
分行业1 | 41 | 38 |
分行业2 | 12 | 9 |
分行业3 | 8 | 2 |
分行业4 | 6 | 5 |
分行业5 | 3 | 2 |
分行业6 | 2 | 1 |
分行业7 | 0.8 | 0.4 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355a943651435bfcf34d2323b657dc5.png)
(1)任选一个分行业,求行业收益率
(2)从7个分行业中任选3个,设选出的收益率
(3)设7个分行业营业收入的方差为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbc29b47b83fdc5368770b7b1acb439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1295cbd36fdc55a55b549aa2dd5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbc29b47b83fdc5368770b7b1acb439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1295cbd36fdc55a55b549aa2dd5887.png)
牛排种类 | 菲力牛排 | 肉眼牛排 | 西冷牛排 | T骨牛排 |
数量/盒 | 20 | 30 | 20 | 30 |
(2)若将频率视为概率,用样本估计总体,从这批牛排中随机抽取3盒,若X表示抽到的菲力牛排的数量,求X的分布列和数学期望.
影片 | 排片场次 | 上座率(%) |
A | 12 | 36 42 45 50 57 62 68 73 80 85 88 94 |
B | 10 | 35 40 46 52 65 65 78 84 90 95 |
C | 9 | 35 38 47 55 60 65 73 82 85 |
D | 9 | 34 37 46 54 60 64 72 81 84 |
(2)假设每场影片的上座率相互独立.从影片A,B,C的以上排片场次中各随机抽取1场,求这3场中至少有2场上座率大于70%的概率;
(3)将影片C和影片D在该电影院正月初一的上座率的方差分别记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98405796b0c8f4958492159ca11f001e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068991d58429792cdbcb317de081126f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98405796b0c8f4958492159ca11f001e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068991d58429792cdbcb317de081126f.png)
![]() | 1号 | 2号 | 3号 | 4号 | 5号 | 6号 | 7号 | 8号 | 9号 | 10号 |
讲座前 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
讲座后 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb00d558e456638de8ff1788db5a8d4.png)
(2)从正确率不低于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c4bf61e073c899494b2fb3b767b108.png)
(3)判断此次公益讲座的宣传效果.并说明你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bba10be8c5718f6d5272b4815fdb4c3.png)
TPI | 不低于4 | |||
拥堵等级 | 畅通 | 缓行 | 拥堵 | 严重拥堵 |
(2)从2023年元旦及前后共7天中任取3天,将这3天中交通高峰期城市道路TPI比2022年同日TPI高的天数记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
(3)把12月29日作为第1天,将2023年元旦及前后共7天的交通高峰期城市道路TPI依次记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ea0ce2c7f77c3cbb97dd399518ff96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b54d2dde31f3258f731eb6e65ad930d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec2472792f1f4d6f8c6920376d4eacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390da18dfb4c75b91d7720a6c504d674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be268a23df6175a7edc001282fc7049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
2011年 | 2012年 | 2013年 | 2014年 | 2015年 | 2016年 | 2017年 | 2018年 | 2019年 | 2020年 | |
甲 | 95.5 | 92 | 96.5 | 91.6 | 96.3 | 94.6 | / | / | / | / |
乙 | 95.1 | 91.6 | 93.2 | 97.8 | 95.6 | 92.3 | 96.6 | / | / | / |
丙 | 97.0 | 95.4 | 98.2 | 93.5 | 94.8 | 95.5 | 94.5 | 93.5 | 98.0 | 92.5 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f452908e724c9966128657203147834.png)
(1)从乙林场植树的年份中任抽取两年,求这两年都是优质工程的概率;
(2)从甲、乙、丙三个林场植树的年份中各抽取一年,以X表示这3年中优质工程的个数,求X的分布列;
(3)若乙丙两个林场每年植树的棵数不变,能否根据两个林场优质工程概率的大小,推断出这两个林场植树成活率平均数的大小?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
员工 部门 | 分数1 | 分数2 | 分数3 | 分数4 | 分数5 |
甲 | 82 | 86 | 81 | 93 | 85 |
乙 | 86 | 89 | 90 | 90 | 92 |