2020高三·全国·专题练习
1 . 把一颗骰子投掷两次,第一次出现的点数记为m,第二次出现的点数记为n,方程组
只有一组解的概率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f69eac7011b8a54e5e2e77debf1f1a0f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 某企业为了解下属某部门对本企业职工的服务情况,随机访问
名职工,根据这
名职工对该部门的评分,绘制频率分布直方图(如图所示),其中样本数据分组区间为:
,
,…,
,
.
![](https://img.xkw.com/dksih/QBM/2021/8/3/2778123869134848/2782009565462528/STEM/40ebd764-6dcd-496d-b7e8-1d4a26613ec8.png?resizew=293)
(1)求频率分布直方图中
的值;
(2)从评分在
的受访职工中,随机抽取
人,求此
人的评分都在
的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.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/686c7282d079715d74fe77757464694d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf83dc956b78d5454067973fed1a33.png)
![](https://img.xkw.com/dksih/QBM/2021/8/3/2778123869134848/2782009565462528/STEM/40ebd764-6dcd-496d-b7e8-1d4a26613ec8.png?resizew=293)
(1)求频率分布直方图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)从评分在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01865849ed69737f96ed4a45fff07223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7318780f0d05863f1d0b4143b639242a.png)
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2021-08-08更新
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4卷引用:新疆乌鲁木齐市第一中学2021-2022学年高一下学期期末考试数学试题