Unit 5, Lesson 5, Grade 7 icon
Unit 5, Lesson 5

Chance Experiments with Outcomes That Are Not Equally Likely

EngageNY 45 min(s)

Students calculate probabilities for chance experiments that do not have equally likely outcomes. It is important that this lesson addresses the common student misconception that outcomes are always equally likely. A weighted die is another example that can be used to show a situation where the six possible outcomes would not be equally likely to occur, and so it is not reasonable to think that each of the six outcomes has a probability of This straightforward example lets students experience probabilities given in a table, outcomes with unequal probabilities, adding probabilities, and finding the probability of a complement (i.e., the probability that an event does not happen).

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