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1 . 已知某公司产品的广告投入
(万元)与利润
(万元)的一组数据如表所示
利润
与广告投入
之间具有较强的线性相关关系,其线性回归直线方程是
,据此模型估计广告投入为9万元时,利润约为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 2 | 3 | 4 | 5 | 6 |
![]() | 15 | 21 | 39 | 50 | 75 |
![](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/b7bd30e3aba83009e670864d0f0870e1.png)
A.112万元 | B.114.5万元 | C.115万元 | D.115.5万元 |
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