Use the graph to find f(3)=[x]

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.

Sis less than or equal to 75 (bottom left)

Ireally don’t understand your problem do you have a better picture of it