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Activity
Maths Challenge

Maths challenge.net: Blonde Hair Brown Eyes

For Students 9th - 10th
A problem involving fractions to determine the fraction of people in a class that have brown eyes.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: The Monty Hall Problem

For Students 9th - 10th Standards
This page gives an example of a probability problem and explains it very thoroughly.