What is the mean absolute deviation for 2, 9, 1, 7, 8, and 9? 1 3 6 8

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.