Two campers left their campsite by canoe and paddled downstream at an average rate of speed of 12 mph. They turned around and paddled back upstream
at an
average rate of 4 mph. The entire trip took 1 hour. How long did the campers spend
heading downstream?

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.