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解题方法
1 . 在某大学自主招生考试中,所有选报Ⅱ类志向的考生全部参加了“数学与逻辑”和“阅读与表达”两个科目的考试,成绩分为
五个等级,某考场考生的两科考试成绩的数据统计如下图所示,其中“数学与逻辑”科目的成绩为
的考生有
人.
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689990096003072/2694865046519808/STEM/f44b83bf-c3dd-4843-8be5-9bee009f1b62.png?resizew=326)
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689990096003072/2694865046519808/STEM/ba08bd84-e363-4112-b15a-e82c7ff087fb.png?resizew=345)
(1)求该考场考生中“阅读与表达”科目中成绩为
的人数;
(2)已知参加本考场测试的考生中,恰有两人的两科成绩均为
,在至少一科成绩为
的考生中,随机抽取两人进行访谈,求这两人的两科成绩均为
的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d75df9d80ce1e0b7cb50464e293864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689990096003072/2694865046519808/STEM/f44b83bf-c3dd-4843-8be5-9bee009f1b62.png?resizew=326)
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689990096003072/2694865046519808/STEM/ba08bd84-e363-4112-b15a-e82c7ff087fb.png?resizew=345)
(1)求该考场考生中“阅读与表达”科目中成绩为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知参加本考场测试的考生中,恰有两人的两科成绩均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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