An animal shelter currently only has 30 dogs and 20 cats what is the ratio of cats to animals

20:50 I think because there's 20 cats and 30 dogs so you'd add them I'd assume because they're all animals but I'm not certain

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.