Author note — to cover

Turn a completed table into probabilities: the named cell over the grand total, or over a row or column total only when the wording restricts the group, with fraction, decimal and percentage answers. Both tiers. Formal P(A given B) notation and given-that questions are Higher, on conditional-from-two-way-tables (Combined events). (P1, P6)

Introduction

—coming soon—

Practice and continue

Practice

Probabilities from a two-way table

A cell count over the grand total, and reading which total a question wants.

Next lesson

Frequency trees

Filling in counts along two successive splits, and reading the finished tree.