Please solve and explain part a

Solution:

You should circle 2 in the units place.

Hope it helps.

Do comment if you have any query.

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.