Consider the ALOHA example. Suppose it is known that X1 ≠ X2. Find the probability that there were 0, 1 or 2 collisions during those two epochs analytically and confirm via R simulation.

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.

Jsnsndndnfjndndndndnd