Lesson plan

The addition rule for the probability of disjoint events

teaches Common Core State Standards CCSS.Math.Content.HSS-CP.B.7 http://corestandards.org/Math/Content/HSS/CP/B/7
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Big Ideas: Disjoint events are events which can't both occur. The addition rule for disjoint events is a special case of the general addition rule. Students were formally introduced to probability in seventh grade with the standard 7.SP-5. This lesson deals with a special case of the general addition rule. Some teachers may prefer to teach the general addition rule first. This lesson builds upon the concepts of probability which were studied during the study of the content in standards S-CP.1 - S-CP.5. Students learn how to apply the Addition Rule for probability in this lesson. This lesson prepares students to use the rules of probability to compute probabilities of compound events in a uniform probability model.