名校
1 . 某校从高一年级学生中随机抽取
名学生作为样本,将他们的期中考试数学成绩(满分
分,成绩均为不低于
分的整数)分成六组:
,
,…,
后得到如图的频率分布直方图.
(1)求图中实数
的值;
(2)若该校高一年级共有学生
人,试估计该校高一年级在考试中成绩不低于
分的人数;
(3)样本中数学成绩在
与
两个分数段内的学生人数分别为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7318780f0d05863f1d0b4143b639242a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57e2bfe23e15caa08f0be5eabd5a18a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf83dc956b78d5454067973fed1a33.png)
![](https://img.xkw.com/dksih/QBM/2021/8/3/2778123869134848/2782009565347840/STEM/b670cb94-2490-4022-a836-d9f832bca1b5.png?resizew=287)
(1)求图中实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若该校高一年级共有学生
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821b8672d030c240ff230a0174aa7a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
(3)样本中数学成绩在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7318780f0d05863f1d0b4143b639242a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf83dc956b78d5454067973fed1a33.png)
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2021-08-08更新
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2卷引用:贵州省黔西南州金成实验学校2021-2022学年高二上学期期末质量监测数学(文)试题