Graphing calculators are powerful tools for teaching and learning probability, allowing students to quickly run numerous trials in a simulation without the tedium of flipping a coin or rolling dice many times. Through calculator simulations, students more easily understand how the observed relative frequency for a large number of trials approaches the theoretical probability, and they begin to understand the variability in sampling. This book's 13 investigations begin with interesting scenarios and take students through simulations. Develop and reinforce the basic concepts of probability, enriching any mathematics curriculum or furthering ideas covered in standard textbooks. Any graphing calculator with a random-number generator can be used. Calculator programs can be entered manually, adapted to other calculators, or downloaded to the TI-82, TI-83, or Casio CFX 9970, 9870, or 9850 from the accompanying CD (Windows and MAcintosh). The book includes complete teacher notes, answers, and blackline masters.