Leo went to a printing shop to print shirts. the first 20 shirts printed cost $12 each, but for every additional shirt printed is $9. in total, he paid $429. how many shirts did he print?

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.