9 Summer 2 Lesson 5

This lesson is from Nrich The dog ate my homework

This problem models the interpretation of statistics for testing for eg. cancer, HIV, pregnancy, DNA at a crime scene, and many other similar situations involving false positives.
Rather than focusing on these potentially difficult topics, however, NRich have chosen a ‘jokey’ theme so that students can get into the maths, then appreciate the real world applications through discussion of what the results mean.

Objective To become more familiar with tree diagrams and interpret them.
Resources Powerpoint
Recording sheet
Tree diagram and two-way table worksheet