2 way tables

A two-way table records a group by two attributes at once, one in the rows and the other in the columns, with row, column and grand totals. This NSW Year 8 maths subtopic goes beyond Stage 4, since the NSW syllabus places two-way tables in Stage 5, and it uses the Stage 4 probability rule.

You will fill in missing cells by subtraction, build a table from a description and convert between a two-way table and a Venn diagram. You will find probabilities with the grand total underneath, including “and”, “or” and “neither” events, and spot the mistake of dividing by a row total. Canteen sales, excursion choices, beachgoers and footy supporters wearing scarves are typical examples. It is part of Year 8 Probability.