Brainlag PlusProbabilities given that something has happened, from Venn diagrams, two-way tables and tree diagrams.
Given that
"Given that" shrinks the group you choose from.
From a Venn diagram or table, the denominator is the number in the given group, not the grand total. P(A | B) means the probability of A, given B.
- In B: 12 + 18 = 30 people. In both A and B: 12
- P(A | B) = 12/30 = 2/5
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 3, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards