复习时间![]() | 2 | 3 | 5 | 6 | 8 | 12 | 16 |
考试分数![]() | 60 | 69 | 78 | 81 | 85 | 90 | 92 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d77f777eebce034f228e1815b871fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d6a08f781b7569580d40e264afcdb5.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
考前一周复习投入时间(单位:h) | 政治成绩 | 合计 | |
优秀 | 不优秀 | ||
≥6h | |||
<6h | |||
合计 | 50 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
(2)经统计,该班共有25人政治成绩不低于85分,评定为优秀,而且在考前一周投入政治学可复习时间不低于6h共有30人,除去抽走的7位学生,剩下学生中考前一周复习政治的时间不少于6h政治不优秀共有6人,请填写下面的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83caa0ad94044a1e206b1cc0b3f85080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953e89f7e797bf8fe9ff31e0d2f66728.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12a76edbb3e98e3ff41c03401769d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50101047632b94dcd5cf8035b093cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e36492ded42e594c63855802dee601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32111fc0e76b9f7f325fd61b8cb6f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493889386e567f2aa3ce0e61111fd8c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4474c49fafb86e3b5101dd5f7f774422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
0.01 | 0.005 | 0.001 | |
6.635 | 7.879 | 10.828 |
选考物理、化学、生物的科目数 | 1 | 2 | 3 |
人数 | 20 | 40 | 40 |
(2)从这100名学生中任选2名,记X表示这2名学生选考物理、化学、生物的科目数之差的绝对值,求随机变量X的数学期望;
(3)学校还调查了这100位学生的性别情况,研究男女生中纯理科生大概的比例,得到的数据如下表:(定文同时选考物理、化学、生物三科的学生为纯理科生)
性别 | 纯理科生 | 非纯理科生 | 总计 |
男性 | 30 | ||
女性 | 5 | ||
总计 | 100 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
附表:
0.10 | 0.05 | 0.010 | 0.001 | |
2.706 | 3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/c0ae45c0-d186-4d03-bdb2-61d26c7695b3.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c715756dfc6d38d80aba6503ac107572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(1)为测试新赛制对选手成绩的影响,该校选择甲、乙两位学生在两种赛制下分别作演练,并统计双方的胜负情况.请根据已知信息补全以下
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
旧赛制 | 新赛制 | 合计 | |
甲获胜 | 6 | ||
乙获胜 | 1 | ||
合计 | 10 | 20 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c8578f06897aa6fb84aa95c797d3d8.png)
(ⅰ)记丙在一道抢答题中的得分为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(ⅱ)已知学生丙在新、旧赛制下总得分的数学期望之差的绝对值不超过0.1分,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99edbd94ac32c0143951c081969bd4.png)
0.15 | 0.10 | 0.05 | 0.025 | |
2.072 | 2.706 | 3.841 | 5.024 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee8ce733d57e35bc7b5ec2ed8519eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377708b4f62aaf48fc6f976b475a4631.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/ddcee643-a474-48e0-bd58-a908139f217d.jpg?resizew=306)
(1)需从高一、高二、高三报名的学生中各抽取多少人?
(2)(i)请补全频率分布直方图;
(ii)求这120名学生运动时间的第80百分位数是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b6518ac452ee4b615327e9d851cf12.png)
得分区间 | 次数 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/2834fce9-f7da-462d-9c43-40182d8e28af.png?resizew=310)
(2)若该同学历次模拟考试中得分的第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b6518ac452ee4b615327e9d851cf12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
改造前这100户月均用电量频数分布表
月均用电量 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
频数 | 12 | 18 | 30 | 22 | 12 | 6 |
月均用电量 | ![]() | ![]() | ![]() | ![]() | ![]() |
频数 | 12 | 24 | 40 | 16 | 8 |
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894894675337216/2895916770099200/STEM/4f0dec2d-7f1e-4ca4-85c8-23f932758ce0.png?resizew=345)
(1)补全改造后这100户的月均用电量的频率分布直方图;
(2)利用以上数据估计该小区在改造完成后,月均用电量低于150度的概率;
(3)该小区现有2000户,若全部改造完成后,估计一个月能节约多少度电?(同一组的数据以这组数据所在区间的中点的值作代表)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3e36a8ddec055b2164ae365daf1326.png)
年份![]() | 2018 | 2019 | 2020 | 2021 | 2022 |
销量![]() | 2 | 3.5 | 2.5 | 8 | 9 |
(1)求氢能源乘用车的销量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)为了研究不同性别的学生对氢能源的了解情况,某校组织了一次有关氢能源的知识竞赛活动,随机抽取了男生和女生各60名,得到如表所示的数据:
了解 | 不了解 | 合计 | |
男生 | 25 | ||
女生 | 20 | ||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
(ⅱ)依据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
参考公式:1.回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f623b4cc87edcbb4cdbcd88ad8d115.png)
2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b817ac9b8621e40bfa3945e68489c282.png)
![]() | 0.050 | 0.010 | 0.001 |
![]() | 3.841 | 6.635 | 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://staticzujuan.xkw.com/quesimg/Upload/formula/6b685c556cc423e4833c1dc671a134cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1065ae0947705c7d16a5a86c78f07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3a08e770d5b030c3219c3ee4a695f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd121f4aeca8a78a320fca1fd1c4d07.png)
周平均阅读时间 少于 | 周平均阅读时间 不少于 | 合计 | |
| |||
| |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdaf501302beeec9d077be02909e3bd.png)
(2)现从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
参考公式及数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)