1 . 某高校为了提升学校餐厅的服务水平, 组织4000名师生对学校餐厅满意度进行评分 调查,按照分层抽样方法,抽取200位师生的评分(满分100 分)作为样本,绘制如图所示的 频率分布直方图,并将分数从低到高分为四个等级:
的值,并估计满意度评分的
分位数;
(2)若样本中男性师生比为
,且男教师评分为80分 以上的概率为0.8, 男学生评分为80分以上的概率0.55, 现 从男性师生中随机抽取一人, 其评分为80分以上的概率为多少?
(3)设在样本中,学生、教师的人数分别为
,记所有学生的评 分为
,其平均数为
,方差为
,所有教师的评分为
,其平均数为
,方差为
,总样本的平均数为
,方差为
,若
,试求
的最小值.
满意度评分 |
| |||
满意度等级 | 不满意 | 基本满意 | 满意 | 非常满意 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267c88e52743f3dedd4e60569cb958fe.png)
(2)若样本中男性师生比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9c934d84feba963335cc7edf01610e.png)
(3)设在样本中,学生、教师的人数分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb785c57f06f8e0051e49a5f1b43fde1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1402b0375d6babc0b979a368d1fbb54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a63cadbf6b0d54955a3c3d1b7a62b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ba484662ddaac29c2c44ed136f79c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb525270c748eddaaecc4a549cca250e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9289410bd35c9d57326b93cc7f4c4767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41042207515dd2e8349c805e6aee400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d954d1e6b433661e694eddc231be784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 如图所示,多面体
,底面
是正方形,点
为底面的中心,点
为
的中点,侧面
与
是全等的等腰梯形,
,其余棱长均为2.
平面
;
(2)若点
在棱
上,直线
与平面
所成角的正弦值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613dedf2d90e58591b7ac4a250ac7b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8a2ca644d9d7cdb4784a4fd28d3904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44fc60c0b360e1b0708a249e4ce0643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
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解题方法
3 . 定义
表示不超过
的最大整数.例如:
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f161c2a3717f1b6c62d0d7dae0b606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723bbeaf377a92b5ad24e480bfb69a5b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 已知动点
分别在圆
和
上,动点
在
轴上,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1f76d593f96f17a696ce7634ab5bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58147d64340ea78bd7d1ea476a77740b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.圆![]() |
B.圆![]() ![]() |
C.![]() ![]() |
D.过点![]() ![]() ![]() |
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解题方法
5 . 已知
为坐标原点,椭圆
的左,右焦点分别为
,左、右顶点分 别为
,焦距为
,以
为直径的圆与椭圆
在第一和第三象限分别交于
两点.且
,则椭圆
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7bcbdbbb687c25f632eee30d354229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50da60823b387df26f73e7c2bad6fcdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c72229b08c676c08a3c7258895375f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc901dd1d60e374325ce193c0ffde5d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3890662033d184c8d3d023bd73ac2aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c2c469e50b231ff7667fbc96c19ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78cdbb36c28316f60aa87cc9aafeecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
6 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87564738fb1cc44f35fda7cf961cdc70.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c194f17325e5c2ec60ca016b8b4aa80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87564738fb1cc44f35fda7cf961cdc70.png)
您最近一年使用:0次
昨日更新
|
187次组卷
|
2卷引用:2024届山东省泰安肥城市高考仿真模拟(二)数学试题
名校
7 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac95c747df54c67fead652016db24012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a673fd2a5c000f0a1671237a6421846.png)
A.8 | B.10 | C.![]() | D.![]() |
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昨日更新
|
660次组卷
|
2卷引用:2024届山东省潍坊市高考三模数学试题
8 . 已知函数
,
,
.
(1)讨论函数
的单调性;
(2)当
时,对
,
,求正整数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595fe063b9a29c7b9bc56b476cdc9421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1670cd7dadea40cc9e09660b09f96bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfe951c0b4ddd9d007a147bef01a0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acda6b6464db27e1ec18a1522406d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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9 . 为了研究高三年级学生的性别和身高是否太于
的关联性,随机调查了某中学部分 高三年级的学生,整理得到如下列联表 (单位:人):
(1)依据
的独立性检验,能否认为该中学高三年级学生的性别与身高有关联?
(2)从身高不低于
的15 名学生中随机抽取三名学生,设抽取的三名学生中女生人数 为
,求
的分布列及期望
.
(3)若低于
的8 名男生身高数据的平均数为
,方差为
,不低于
的10 名男生身高数据的平均数为
,方差为
.请估计该中学男生身高数据的平均数 和方差.
附:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e38ddbe304a1862c612db18b33445f1.png)
性別 | 身高 | 合计 | |
低于 | 不低于 | ||
女 | 14 | 5 | 19 |
男 | 8 | 10 | 18 |
合计 | 22 | 15 | 37 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0298d106f2b72aadf3cffce041a25da6.png)
(2)从身高不低于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e38ddbe304a1862c612db18b33445f1.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)若低于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e38ddbe304a1862c612db18b33445f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570e12cac0e6fb3f1ef16a402f1cb8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd37b14fa41dfebb3d7856cee7a0b314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e38ddbe304a1862c612db18b33445f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2a7cd189ed24a9cc7748f7f07617e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6db5b7662f0b9ca489b9122b7061634.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9618acfe4c5d6099ee30fd7968b4d83.png)
0.1 | 0.05 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
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10 . 已知函数
,则满足不等式
的
取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d816ac50607f9d701ba0c9b6962234e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3487088dba055acd3afed7dff0bb341b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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