Someone i have a quiz tommorow explain how to do this

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.

Yes. there is a constant ratio of number of calories to gram of protein.12/3=24/4=32/8=44/11=4