Happy Birthday to . . . Two?

This Happy Birthday to . . . Two? lesson plan also includes:

How many people do you need in a room before two likely share the same birthday? Scholars consider this puzzle by analyzing a set of data. They ponder how to divide the data and determine the proper size of a group for this event to likely happen based on experimental probability.

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CCSS: Designed
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Instructional Ideas
  • Introduce the Julian dating system prior to starting the lesson
  • Repeat the activity with another group such as students in the class, students in the grade level, etc.
Classroom Considerations
  • Relies on prior knowledge of numerical and categorical data, comparing and ordering numbers, understanding probability, manipulating a spreadsheet, and using data to compute experimental probabilities
  • Offers many extension ideas
  • Provides both formative and summative assessments with answers
  • None