Demystifying - Probabilities from a two-way table

Drills

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

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)

  • Fluency — direct questions on probabilities from a two-way table, limited to this lesson's stated scope (4 questions).
  • Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
  • Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).

The test

—coming soon—

Where to go next

The method this drill practises is taught on Probabilities from a two-way table.