The sum of the ages of ruth and her mother is 77 years. the difference in their ages is 27 years. how old is each?

Ruths mom is 47 years old and Ruth is 30 years old because 47+30=77 and 47-30=27

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.