Unit 1 Festival around the world新人教版英语必修三Unit 2 Healthy eatingUnit 3 The Million Pound Bank-NoteUnit 4 Astronomy:the science of the starsUnit 5 Ganada——The True NorthUnit 1 Festival around the w
4.(2010·南阳市一中高一下学期期中检测)在样本的频率分布直方图中一共有n个小矩形若中间某一个小矩形的面积等于其余n-1个小矩形面积和的且样本容量为160则中间该组的频数是( )A.32 B.20 C.40 D.25
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