http://erc.msh.org/quality/example/exampl18.cfm
A histogram is a graphical representation of the frequency of occurrences of a certain data set. Each bar represents an amount of times a particular variable occurred. In this histogram, the waiting time during some registration is what was being measured. As you can see, waiting anywhere from 61-90 minutes was the most common time of wait during registration. Waiting 91-120 minutes happened the least with only two occurrences.
A graphical representation which shows a visual impression of the distribution of data termed as Histogram . Histogram consists of tabular frequencies which are shown as adjacent rectangles, with an area equal to the frequency of the observations in the interval.
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