Identify the points corresponding to p and q.
p'4,0), q'(4, 3)
p'(5,0), q'(2, 3)
p'(5,0), q'(4,3)
p'(1,0), q'(2,3)

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.