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In the five sixth-grade classrooms there are 26, 29, 31, 33, 36 students,
What is their average (mean) number?

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.