名校
1 . 某城市
户居民的月平均用电量
单位:度
,以
,
,
,
分组的频率分布直方图如图.
的值;
(2)在这
户居民中,月平均用电量不低于
度的有多少户?
(3)在月平均用电量为
,
的四组用户中,用分层抽样的方法抽取
户居民,则月平均用电量在
的用户中应抽取多少户?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04aa62eda5d19e65d1fea8dfeb16c403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff14fbc9d46c23b76866fbbf57e3385.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574308e4359db72637525cb24b497309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1aad8893a5f92dab76e43d39cf6ef1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在这
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc011a0862d1f780331f1e9f8a467a9.png)
(3)在月平均用电量为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c275c0b17aa9f7a10c97ef3340b3415e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564b1a6019aa0ea164ee016a301fd890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebf36dca75645158bf7343919c55cce.png)
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14卷引用:上海市奉贤中学2023-2024学年高二下学期3月月考数学试卷
上海市奉贤中学2023-2024学年高二下学期3月月考数学试卷吉林省长春市长春外国语学校2022-2023学年高一下学期6月月考数学试题9.2.1总体取值规律的估计练习(已下线)9.2.1总体取值规律的估计(第2课时)(已下线)专题9.5 统计全章八大压轴题型归纳(拔尖篇)--举一反三系列(人教A版2019必修第二册)(已下线)专题9.3 统计图的相关运算大题专项训练-举一反三系列(人教A版2019必修第二册)(已下线)9.2.1?总体取值规律的估计——课后作业(提升版)(已下线)专题02 用样本估计总体-《知识解读·题型专练》(人教A版2019必修第二册)(已下线)第九章 本章综合--方法提升应用【第三练】“上好三节课,做好三套题“高中数学素养晋级之路(已下线)专题14.1统计(1))--重难点突破及混淆易错规避(苏教版2019必修第二册)(已下线)第九章:统计(单元测试)-同步精品课堂(人教A版2019必修第二册)(已下线)第九章:统计(单元测试,新题型)--同步精品课堂(人教A版2019必修第二册)(已下线)专题05 第九章 统计-期末考点大串讲(人教A版2019必修第二册)(已下线)核心考点9 统计 B提升卷 (高一期末考试必考的10大核心考点)
名校
2 . 已知定义在
上的函数
,若存在实数
,
,
使得
对任意的实数
恒成立,则称函数
为“
函数”;
(1)已知
,判断它是否为“
函数”;
(2)若函数
是“
函数”,当
,
,求
在
上的解.
(3)证明函数
为“
函数”并求所有符合条件的
、
、
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3897bf276a0b6c2121917d39b369df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d637d748a2b196af6d91703881ae1f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3897bf276a0b6c2121917d39b369df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67758380edd3796902534cf0e52cb6a1.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9697e701323f29c2b8fb4b69fdec2a50.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3897bf276a0b6c2121917d39b369df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901a683d7456f2b2135bccb41e70e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad324be3bebd9c8051c5f502df2b536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51870c1132971c292e4498255210546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4947f55ebd9b5438e46cb120d51be615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966055559e213bce8e92ef59ba03d2d4.png)
(3)证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa79143526cf263a8fff8030446efa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67758380edd3796902534cf0e52cb6a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
名校
3 . 在平面直角坐标系
中,
为坐标原点,动点
在直线
上运动,动点
在直线
上运动,
为平面上的一个动点,记
,
,
.
(1)若
,
,求
与
夹角的余弦值;
(2)若
,求
的取值范围;
(3)若点
,且满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95dc642eb6d03682732229852d337d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98efe3f981c7b6524a9cff7381624b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75561ca2ccf1fc9a938d4ce0891712d2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02af485e17e7628fd5a3ace6e0a32ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f20f723485b20d32298961be4c7970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e16eb319ee454088f5b527cf6c4d5.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88e8278d12097ff726d90b0cd86078f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3067e361a380aecb535ccbb51025d0cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88451afc05ae8882392e0bf6ea5809a4.png)
您最近一年使用:0次
4 . 已知定义域为
的函数
,其图象是连续的曲线,且存在定义域也为
的导函数
.
(1)求函数
在点
的切线方程;
(2)已知
,当
与
满足什么条件时,存在非零实数
,对任意的实数
使得
恒成立?
(3)若函数
是奇函数,且满足
.试判断
对任意的实数
是否恒成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851c68ef2e0703706f3b528daa902eb8.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d0d5f2bae6b38d6877b8b40865e834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3832d863e6cefdfe45cff4319e1fbdb.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48a3e7a13ec19e1ba5ba54e520c76df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e06618e1fff402ca9269e10a396532f.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e084f839e9b7a03fea8b0b596674fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ddc12af8da0819a120eaae5858c4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
5 . 已知
是公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a4658ab94306d39aedda17deed7216.png)
的等差数列,其前
项和为
,
是公比
为实数的等比数列,
,
.
(1)求
和
的通项公式;
(2)设
,计算
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a4658ab94306d39aedda17deed7216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68b7cce6f8165a164c90c33430e2b17.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac5b6ecc4aa0233cd3fcc4668a6bb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5249095e0c2a28875a40a5d9c2c56bac.png)
您最近一年使用:0次
6 . 如图
是由两个三角形组成的图形,其中
,
,
,
.将三角形
沿
折起,使得平面
平面
,如图
.设
是
的中点,
是
的中点.
与平面
所成角的大小;
(2)连接
,设平面
与平面
的交线为直线
,判别
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1527ab37e0ce210fac7fa0164afde5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43fcce40446633bf9e0b7a9acf58052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8520a21b909d04f763d0f61dd74bc158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb90428135c2058f07e2c798f71b5b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f493fa40faff9c21b7aedca05de9379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
您最近一年使用:0次
7 . 某学生兴趣小组随机调查了某市100天中每天的空气质量等级和当天到某公园锻炼的人次,整理数据得到下表(单位:天):
(1)求一天中到该公园锻炼的平均人次的估计值(同一组中的数据用该组区间的中点值为代表);
(2)若某天的空气质量等级为
或2,则称这天“空气质量好”;若某天的空气质量等级为3或4,则称这天“空气质量不好”.根据所给数据,完成下面的
列联表,请根据表中的数据判断:一天中到该公园锻炼的人次是否与该市当天的空气质量有关?(规定显著性水平
)
附:
,
.
锻炼人次 空气质量等级 | ![]() | ![]() | ![]() |
1(优) | 3 | 18 | 25 |
2(良) | 6 | ![]() | 14 |
3(轻度污染) | 5 | 5 | 6 |
4(中度污染) | 6 | 3 | 0 |
(2)若某天的空气质量等级为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead9d6ff51996f3ebace6f212e11a9e4.png)
人次≤400 | 人次>400 | 总计 | |
空气质量好 | |||
空气质量不好 | |||
总计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187714e660234f0b72f2b47d3ea685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7f0bc8fd14ba7faabbc8cb24dcbdb3.png)
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8 . 已知曲线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
,
是坐标原点, 过点
的直线
与曲线
交于
,
两点.
(1)当
与
轴垂直时,求
的面积;
(2)过圆
上任意一点
作直线
,
,分别与曲线
切于
,
两 点,求证:
;
的直线
与双曲线
交于
,
两点(
,
不与
轴重合).记直线
的斜率为
,直线
斜率为
, 当
时,求证:
与
都是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80b861ba40387cb2bcd04945f5a371a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5226a2e1ee83a869b1133a234e9f3108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
(2)过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be68dfb4d8b5f3adfc250b7d23e64165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada25f76504c3fd1226da43c94cb4277.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1892b7c3cd7bea116f532f66fba44662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284185654ca00ac9df0155d4c519a063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d303eb7923a91dcecc2d9bc1133d5c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38d23c520f89002afb0338bcb7b62c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22871505498b73670d0ee432ba402631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2297d08e5496a1af3f9ed1a1bbaea06.png)
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名校
9 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd8331d5ac755a3e6a7199f7009b87b.png)
(1)求方程
在
上的解集
(2)设函数
,
.
①证明:
在区间
上有且只有一个零点;
②记函数
的零点为
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd8331d5ac755a3e6a7199f7009b87b.png)
(1)求方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4dc99c6b418baf1c3fe26dc43ed9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bccd6a6e85bdf500218a3e75b31f3c.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed89ab8263c8b8395936f3f062c432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa004bb9f1f0272f436081ebf431c283.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5a90aeba435af22d6bcdb7b91650b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68d62482d548bcd517188178fd36bc3.png)
②记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5a90aeba435af22d6bcdb7b91650b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c9cec8a8c34da83e265ab7ce8b1281.png)
您最近一年使用:0次
2024-03-27更新
|
353次组卷
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2卷引用:上海市奉贤中学2023-2024学年高一下学期3月月考数学试卷
名校
10 . 2022年2月4日,第24届冬季奥林匹克运动会开幕式在北京国家体育场(鸟巢)举行,某调研机构为了了解人们对“奥运会”相关知识的认知程度,针对本市不同年龄和不同职业的人举办了一次“奥运会”知识竞赛,满分100分
分及以上为认知程度高),结果认知程度高的有
人,按年龄分成5组,其中第一组
,第二组
,第三组
,第四组
,第五组
,得到如图所示的频率分布直方图,已知第一组有10人.
人的平均年龄;
现从以上各组中用分层随机抽样的方法选取20人,担任本市的“奥运会”宣传使者.
(2)若有甲(年龄
,乙(年龄
两人已确定入选,现计划从第四组和第五组被抽到的使者中,再随机抽取2名作为组长,求甲、乙两人至少有一人被选上的概率;
(3)若第四组宣传使者的年龄的平均数与方差分别为36和
,第五组宣传使者的年龄的平均数与方差分别为42和1,据此估计这
人中
岁所有人的年龄的方差.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97187627839878fd94624d9b049c0bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277c057d25e676a5d39dd66f965a8496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8a6593c9e78d9b2e2e380191d29e1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c1aa7dfe4e97c9e9c06eb8c4c2d152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd92cca0f722eacaab241f81435b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc0f856681ae7015c5b4dab636b0426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
现从以上各组中用分层随机抽样的方法选取20人,担任本市的“奥运会”宣传使者.
(2)若有甲(年龄
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0dc7aa10bb769f32f1927689c860216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a572c9c81b947663fc9bcaa2fbb5252.png)
(3)若第四组宣传使者的年龄的平均数与方差分别为36和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af98af8ff37783900b3405e0eddd01a.png)
您最近一年使用:0次
2024-03-26更新
|
731次组卷
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9卷引用:上海市奉贤中学2023-2024学年高二下学期3月月考数学试卷
上海市奉贤中学2023-2024学年高二下学期3月月考数学试卷湖北省鄂州市2021-2022学年高一下学期期末数学试题黑龙江省哈尔滨市六校2021-2022学年高一下学期期末联考数学试题山西省运城市2022-2023学年高一下学期期末数学试题(已下线)期末专题11 概率综合-【备战期末必刷真题】(已下线)专题10.6 概率全章八大压轴题型归纳(拔尖篇-举一反三系列(人教A版2019必修第二册)(已下线)【北京专用】高一下学期期末模拟测试A卷(已下线)专题10 中位数、平均数、方差、直方图等归类(2) -期末考点大串讲(苏教版(2019))(已下线)专题06 概率-期末真题分类汇编(人教A版2019必修第二册)