直方图能说明什么？数据的图形表示方法不计其数，直方图是其中出类拔萃的一种。直方图与柱状图有些相似，能迅速而有效地汇总数据。它可以量度数据的分布、差异、集中趋势等。无论数据集多么庞大，只要画一张直方图，就能”看出“数据中的奥妙。
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