名校
解题方法
1 . 某蔬菜加工厂加工一种蔬菜,并对该蔬菜产品进行质量评级,现对甲、乙两台机器所加工的蔬菜产品随机抽取一部分进行评级,结果(单位:件)如表1:
![](https://img.xkw.com/dksih/QBM/2020/4/13/2440495153692672/2441509298208769/STEM/f59879790292423b9f7ae5a60d7a0d26.png?resizew=539)
(1)若规定等级
为合格等级,等级
为优良等级,能否有
的把握认为“蔬菜产品加工质量与机器有关”?
(2)表2是用清水
千克清洗该蔬菜
千克后,该蔬菜上残留的农药
微克的统计表,若用解析式
作为
与
的回归方程,求出
与
的回归方程.(结果精确到
)(参考数据:
,
,
,
.)
![](https://img.xkw.com/dksih/QBM/2020/4/13/2440495153692672/2441509298208769/STEM/f59879790292423b9f7ae5a60d7a0d26.png?resizew=539)
(1)若规定等级
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0557ecd5071a9c5fb9da5809f5aec9a.png)
(2)表2是用清水
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6ff287dac197d3a8f6181df2f2d764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ceb08c617622847711f606498e0b532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311655780c0bbc6bd2410d769bd9a69a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d8cb336900613bd3fd92d76a65957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a979eef68a999a7ca82dce517981d0.png)
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2020-04-14更新
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3卷引用:广东省大埔县虎山中学2019-2020学年高二下学期期中数学试题
广东省大埔县虎山中学2019-2020学年高二下学期期中数学试题河南省郑州市中牟县2018-2019学年高二下学期期末考试理数试题(已下线)文科数学-2020年高考押题预测卷03(新课标Ⅰ卷)《2020年高考押题预测卷》