Wolfram Research
Wolfram Math World: World's Most Extensive Mathematics Resource
MathWorld provides a huge mathematics encyclopedia detailing the concepts of geometry, algebra, calculus, discrete math, number theory, and other math topics--complete with formulas, diagrams, examples, and references for thorough...
CK-12 Foundation
Ck 12: Using Probability to Make Decisions
Use this Common Core Math Standards Browser to search specific math concepts and their corresponding standards. This page focuses on Using Probability to Make Decisions. Click on the links to find lessons, activities, videos, and study...
Teachnology
Teachnology: Teacher Guide to Probability and Statistics
Statistics Theme provides a collection of free sample worksheets, teacher resources, lesson plans and interactive media for grades k-12.
University of Illinois
University of Illinois: A Short Lesson in Probability
This site from the University of Illinois gives a simulation and then asks questions about it.