Oswego City School District
Regents Exam Prep Center: Mutually Exclusive Events
Use this site to learn what is means for two events to be mutually exclusive. Great examples show you how to calculate the probability of such events.
Yale University
Yale New Haven Teachers Institute: Introduction to Mathematical Probability
This site gives an overview of probability, including example problems and a reading list. Exhaustive and detailed, this should help dramatically with students looking to study probability.
Rice University
Hyper Stat Online Statistics Textbook: Mutually Exclusive Events
This resources offers a brief, one paragraph description of mutually exclusive events and gives an example for further clarification.