In how many ways can you rearrange the letters in the word reach?

25 is correct.

Square how many letters there are. In this case 5.

So 5squared or 5 x 5.

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.