Shodor Education Foundation
Shodor Interactivate: Lesson: Conditional and Simultaneous Probability
This lesson plan deals with conditional probability and the probability of simultaneous events. Problems included in this lesson tend to have solutions that are counterintuitive. This presents an opportunity to investigate more deeply...
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.