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In grades 68, students explore the difference between complementary and mutually exclusive events, and learn to use appropriate terminology to describe them. Students also learn to employ proportionality and a basic understanding of probability to explore notions of chance, make predictions, observe outcomes, and test conjectures about the results of experiments and simulations, using methods such as organized lists, tree diagrams, and area models to compute probabilities for simple compound events. Middle School Problems of the Week that require some knowledge of probability are listed below. They address the NCTM Data Analysis and Probability Standard for Grades 68. For background information elsewhere on our site, explore Middle School Probability and Statistics in the Ask Dr. Math archives; and see Probability and Probability in the Real World from the Dr. Math FAQ. For relevant sites on the Web, browse and search Probability in our Internet Mathematics Library; to find middleschool sites, go to the bottom of the page, set the searcher for middle school (68), and press the Search button. Access to these problems requires a Membership. 
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