The Birthday Problem
The Birthday Problem is a classic statistics problem that asks how likely it is for two people out of a class of n people to have the same birthday. The results seem paradoxical because the probability is higher than one might expect. The reason for the higher-than-expected probability is because the question asked is not how likely someone might have their birthday on a certain date, but rather how likely it is for any two people to have the same birthday. This subtle difference has a big impact on the outcome.
First, download the program using the link below. If the program does not open, try installing the latest version of Java, which can be found here.
Enter the number of people in the group in the text box. Use the radio buttons to specify whether you want to calculate the probability that two or more people will have the same birthday or three or more people will have the same birthday. Then, click calculate to get the solution in percent.
