What is the midpoint of (-11,0) and (9,-1)

X = (-11+9)/2 = -1

y = (0+(-1))/2 = (0-1)/2 = -1/2

midpoint (-1,  -1/2)

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.