A shelf is supported with brackets as pictured in the diagram below. What is the width of the shelf?
A 14 in.
B 16 in.
C 12 in.
D 10 in.

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.