名校
解题方法
1 . 为了解学生的体能情况,抽取某学校一、二年级部分学生进行跳绳测试,将所得的数据整理后画出频率分布直方图(如图),设一年级跳绳次数为
,二年级跳绳次数为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c91db0da2a076c2ed5e074125ac5f0.png)
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.(填“
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096b1ece1dcd29c59a46a4b3e02cb548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5031a3a951c4a1d1c5e9f80a5e26513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c91db0da2a076c2ed5e074125ac5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c91ae3927b20381ce27d14489fc733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
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