A computer monitor is 20
20 inches wide. The aspect ratio, which is the ratio of the width of the screen to the height of the screen, is
16
:
9
16:9.
​What is the length of the diagonal of the screen, to the nearest whole inch?
​

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.