Answer
1) Histograms have no empty spaces between the bars.
2) The graph has no title and the axes have no label.
Work Step by Step
1) Empty spaces confuse the reader.
2) The height of the bar for "45-49" is 7. What does it mean? Seven presidents were from 45 to 49 years old on Inauguration Day or seven percent of the presidents were from 45 to 49 years old on Inauguration Day?
