Packs of pens are $3.5 each with a $6 delivery charge when ordered online. a. Write an equation to represent the total spent on packs of pens based on the number purchased.
b. Graph the equation.

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.