_ A'B'C' is a rotation of ABC 180° about the origin. What is the
length of A'C?
A.) 3 units
B.) 4 units
C.) 13 units
D.) 6 units

Answer is : D 6 units

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.