http://searchsoftwarequality.techtarget.com/sDefinition/0,,sid92_gci330729,00.htmlA histogram is a map used for statistical data. Histograms show the frequency of certain data with equal intervals horizontally and vertically. The histogram above is a hypothetical histogram to explain what histograms are. A hypothetical class of students took an exam and the histogram shows their hypothetical grades. The red rectangle shows that about three people mades 0 to 20, while the pink graph shows that about 8 people make from a 20 to a 40 on the exam. The following one shows how many people made a 40 to a 60 and so on.
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