Sonia purchase envelopes at the cost of $3.50 each, including tax, and postcards at the cost of $1.25 each, including tax. If Sonia bought the envelopes and the postcards with a $20.00 bill and received a $2.25 change, how many postcards did Sonia buy?

Hi i’m back in town now i’ll see ya soon bye

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.