Scale Factor - Finding Sides. find x and y. 1) Scale factor of A to B is 1:2
2) Scale factor of Q to P is 1:3

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.