1 . 二战期间,为估计德军坦克的月生产能力,盟军请统计学家参与情报的收集和分析,统计学家从缴获的德军坦克中,随机抽取某月生产的坦克编号作为样本来估计坦克月生产量.抽取的坦克编号从小到大依次为
,假设坦克的月生产量为
,
将区间
分成
个小区间:
,
,……,
,
,统计学家利用前
个区间的平均长度
来估计所有
个区间的平均长度,进而得到
的估计值.若抽取的某月生产的坦克编号为2,13,41,75,107,118,159,194,206,230,则
的估计值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1a2f40c3c0853c0d5a4150a9d3fc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/124a5c43532fa3ec2d5763e469454fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8322f7eb3a5be31bf422fc8588185039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67be96ddccdf75d4af2287d9ad8fcce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0876215b2fd463d151523cd3c6b447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8a5e623f2b17d24c196a2c298812ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73edac5f52303352b2dd31b2c9b3f5e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef01e82a562bbdd54d854422f94b44b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5b15e852b9eb6b6ece4817725814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9f29abda46edf654866e9594f91a1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0876215b2fd463d151523cd3c6b447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
A.236 | B.253 | C.360 | D.420 |
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