This lesson plan helps students develop tree diagrams and figure probability of events based on diagrams. Lots of resources are available to support teachers and students at this website.

The Shodor Education Foundation provides this lesson plan. In it, students explore where probability can be applied to professional sports. NCTM standards are listed for this lesson plan.

This tutorial demonstrates how tree diagrams are constructed and shows how to calculate the probability of an event using a tree diagram. There are links to a lesson, practice page, and teacher resource pages with useful tips.