Learning objective

Calculate conditional probabilities in basic situations, using the formula P(A | B) = P(A ∩ B)/P(B), though the formula itself is not required knowledge.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

Cambridge IGCSE StatisticsProbability

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Quick explanation

This point belongs to Probability, especially Probability outcomes.
You need to be able to calculate conditional probabilities in basic situations, using the formula P(A | B) = P(A ∩ B)/P(B), though the formula itself is not required knowledge.
The key ideas to know are Calculate and Determine.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

CalculateDetermine

Why it matters

This objective helps connect Probability outcomes to exam-style questions, flashcards, and revision notes for Probability.

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Flashcards10 linked cards

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Practice Questions7 linked questions

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Paper 1Statistical Techniques2 marks

Description

A bag contains 5 red balls and 3 blue balls. One ball is drawn at random.

a
Calculate the probability that the ball is red given that a ball has been drawn from the bag.
Your answer
Aim for approximately 2 distinct marking points.
[2]

Revision notestopic notes

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