1 . 有
位工人在某天生产同一种零件,所生产零件个数的茎叶图.如图所示,已知他们生产零件的平均数为
,标准差为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a25d8f9593923203536dc9264f7060.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644352737181696/2646817570824192/STEM/e43b723e1c914d0e8d8b37c6381677c4.png?resizew=163)
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2021-01-29更新
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136次组卷
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2卷引用:四川省南充市2020-2021学年高二上期期末考试数学(文科)试题