Round 4.93 to 1 decimal place

4.93
    ^ This number is less than 5, so we round down to 4.9.

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.

Ithink the answer is d.