Did I Get This – Relative Frequency
What are the breakfast-eating habits of college students?
On a random typical weekday, a group of 460 college students was surveyed and 253 of them reported that they had eaten breakfast that day. Let B represent the event of interest — that a college student eats breakfast.
http://phhp-faculty-cantrell.sites.medinfo.ufl.edu/files/2012/12/DIG_05002_095.swf
http://phhp-faculty-cantrell.sites.medinfo.ufl.edu/files/2012/12/DIG_05003_095.swf
This document is linked from Introduction to Probability.