To practice for a competition, Maggie swam 940 meters in the pool each day for 2 weeks. How many kilometers did Maggie swim in those 2 weeks? 1 m = 0.001 km

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.