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某学校随机抽取20个班,调查各班中有网上购物经历的人数,所得数据的茎叶图如图所示...
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某学校随机抽取20个班,调查各班中有网上购物经历的人数,所得数据的茎叶图如图所示.以组距为5将数据分组成[0,5),[5,10),…,[30,35),[35,40]时,所作的频率分布直方图是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745724900/SYS201310251243157457249006_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745724900/SYS201310251243157457249006_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745724900/SYS201310251243157457249006_ST/images3.png)
D.
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