Lia has a dog and a cat. Together, the pets weigh 15 pounds. The dog weighs 2 times as much as the cat.

How much does each pet weigh?

The dog weighs 10 pounds and the cat weighs 5 pounds

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.