What's bigger 4 kilograms or 4,100 grams

4,100 grams because if the grams was 4,000 than they i think are equal so the grams has 100 more 
                                                     -Getsoleanna

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.