High School StatisticsProbabilityabout 1 minCCSS 7.SP.C.8.aUnderstand that, just as with simple events, the probability of a compound event is the fraction of outcomes in the sample space for which the compound event occurs.CCSS HSS.CP.A.2Understand that two events A and B are independent if the probability of A and B occurring together is the product of their probabilities, and use this characterization to determine if they are independent.CCSS HSS.CP.B.8Apply the general Multiplication Rule in a uniform probability model, P(A and B) = P(A)P(B|A) = P(B)P(A|B), and interpret the answer in terms of the model.+0
Twenty-three people. One surprising question. You choose what to test.
Lesson Plan
Calculate the probability of a shared birthday by counting pairs and using the complement rule.
Question: Ask what students spot and what they are curious about. Read “23 people. What are the odds?” aloud. Have each student guess and say why.
Question: Read “253 pairs. What are the odds?” aloud. Have partners explain their guesses to each other.
Question: Read “A class of 30. What are the odds?” aloud. Ask a student who guessed differently to explain.
Discussion: Have students ask others, then compare what they found.
How to run it
Whole classPut the lesson on the board. At each choice the class votes, then you select the winner.
SoloShare the link, QR code, or post to Google Classroom. Each student gets to take their own path.
