Read Joint and Marginal Counts
Build a two-way table and distinguish a joint event from a total category.
Open lesson 1Count Carefully in Probability Models
Use two-way counts, conditional sample spaces, independence tests, and updated draws.
Before you begin
- Read and simplify fractions and multiply them.
- Understand an equally likely draw and distinguish and from given.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Find a probability after information is given
Restrict the sample space before calculating a conditional probability.
Open lesson 2Test Whether Two Attributes Are Independent
Compare a conditional probability with its unconditional probability.
Open lesson 3Track Two Draws Without Replacement
Multiply a first-draw probability by the correctly updated second-draw probability.
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.