An average library contains at least 50 and at most 250 books. how many library owners must be polled to be certain that at least two owners have the same number of books in their libraries?

Math - Steve, Wednesday, May 7, 2014 at 4:35pm
there are 201 numbers from 50 to 250.

So, clearly, if 202 people are polled, at least two of them must have the same number.

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.