May 20, 2015

Students use a hypothetical 1,000 two-way table to calculate probabilities of events.

Students calculate conditional probabilities given a two-way data table or using a hypothetical 1,000 two-way table.

Students use two-way tables (data tables or hypothetical 1,000 two-way tables) to determine if two events are independent.

Students interpret probabilities, including conditional probabilities, in context.

Teacher and Student versions of full lesson from engageNY

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Make sense of problems and persevere in solving them.

Reason abstractly and quantitatively.

Attend to precision.

Look for and make use of structure.

Look for and express regularity in repeated reasoning.

Construct and interpret two-way frequency tables of data when two categories are associated with each object being classified. Use the two-way table as a sample space to decide if events are independent and to approximate conditional probabilities.

Recognize and explain the concepts of conditional probability and independence in everyday language and everyday situations.

Find the conditional probability of A given B as the fraction of B's outcomes that also belong to A, and interpret the answer in terms of the model.