次数分布曲线图的横坐标代表各组数据的
A.上限
B.中点
C.下限
D.平均值
正确答案是B
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Rearrangethe following sentences so that they read logically. Put the correspondingletters in a proper sequence on the answer sheet The positions of somesentences have been given. A.Industries and government contribute another 20 percent:the large