Histogram (from Internet Glossary of Statistical Terms)

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A histogram is a way of graphically showing the characteristics of the distribution of items in a given population or sample. Here is a histogram of the measures of height in the illustrated population. In a histogram each measure is represented by a single block that is placed over the midpoint of the class interval into which the measure falls.

The measures of the heights in inches of the individuals shown below are: 56, 54, 64, 68, 38, 46, 62, 67 and 77.

A Histogram of nine people's heights