Which equation is a function of x? x = 5
x = y squared + 9
x squared = y
x squared = y squared + 16

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.