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解题方法
1 . 武汉市重点中学联合体高一年级举行了期中统一考试,随机抽取一部分学生的数学成绩分组统计如下表:
(1)求出表中m,n,M,N的值,并根据表中数据补全频率分布直方图;
![](https://img.xkw.com/dksih/QBM/2022/1/10/2891473789681664/2892876274671616/STEM/aa3bf8cf82004291beb31cfbc0fc1914.png?resizew=312)
(2)请根据频率分布直方图估计这次数学成绩的样本数据的第35百分位数;
(3)命题老师在考前期待这份试卷成绩的平均分在95到105之间,请你根据频率分布直方图估计最终成绩是否符合他的期待?
分组 | 频数 | 频率 |
[0,30) | 2 | 0.02 |
[30,60) | 5 | 0.05 |
[60,90) | 35 | 0.35 |
[90,120) | m | n |
[120,150] | 13 | 0.13 |
合计 | M | N |
![](https://img.xkw.com/dksih/QBM/2022/1/10/2891473789681664/2892876274671616/STEM/aa3bf8cf82004291beb31cfbc0fc1914.png?resizew=312)
(2)请根据频率分布直方图估计这次数学成绩的样本数据的第35百分位数;
(3)命题老师在考前期待这份试卷成绩的平均分在95到105之间,请你根据频率分布直方图估计最终成绩是否符合他的期待?
您最近一年使用:0次
2022-01-12更新
|
833次组卷
|
4卷引用:江苏省泰州市靖江高级中学2021-2022学年高一下学期第二次阶段考试数学试题
2 . 可以用尺规作图画出正五角星,作法如下:以任意一点为圆心,以1为半径画圆
,在圆
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和
.取线段
的中点
,以
为圆心,以
为半径作弧,交
于
.以
为圆心,以
为半径在圆
上依次截取相等的圆弧,连接
,
,
,
,
,得到如图所示的正五角星,则图中扇形
的面积为( )
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您最近一年使用:0次