Mariah walks 6miles per hour. Bobby walks 4,400 yards in in a half-hour. Given that 1 mile = 1,760 yards, how much faster does Mariah walk than Bobby?

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.