Nelly bought a computer for $400. it was on sale for 20%. what was the original price?

$500

x*.8=400
divide .8 from both sides
x=500

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.