Year 11 conditional probability quiz to download as PDF

This Year 11 conditional probability quiz has 10 short questions for pupils aged 15-16. Type your answer, check it straight away and read the explanation when you get one wrong.

Year 11 conditional probability quiz: the 10 questions

(Higher) State what P(A | B) means in words.
(Higher) 12 of 30 girls play sport. P(plays sport | girl)?
(Higher) Bag 5 red 5 blue. Red taken. P(second red)?
(Higher) P(A and B) = 0.12, P(B) = 0.4. P(A | B)?
(Higher) In a conditional probability, which group is the new total?
(Higher) If P(A | B) = P(A) the events are...?
(Higher) 20 pupils like tea, 5 of them also like coffee. P(coffee | tea)?
(Higher) A bag has 2 red 3 blue. Blue is taken. P(second blue)?
(Higher) P(A|B) = P(B|A) always? Yes or no.
(Higher) Tree with replacement: does the second set of probabilities change?

How to use this Year 11 conditional probability quiz

First, answer every question without a calculator unless the question says so. Then check your answer and read the short explanation. If you get fewer than 7 right, revise the conditional probability lesson and try again later. After that, try the multiple choice questions or the conditional probability worksheet.

Finally, take this quiz again before a test, because quick retrieval helps you remember. Moreover, all the pages of this chapter work together, so you can move between them at any time. For example, many pupils read the lesson on Monday, practise on Wednesday and test themselves on Friday.