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Learning objective

Comprehend the concept of mutually exclusive events, applying the rule P(A ∪ B) = P(A) + P(B) for such events, and understand the rules for independent events, using P(A ∩ B) = P(A) × P(B).

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

Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE StatisticsProbability

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Quick explanation

Comprehend the concept of mutually exclusive events, applying the rule P(A ∪ B) = P(A) + P(B) for such events, and understand the rules for independent events, using P(A ∩ B) = P(A) × P(B)

  • This point belongs to Probability, especially Probability outcomes.
  • You need to be able to comprehend the concept of mutually exclusive events, applying the rule P(A ∪ B) = P(A) + P(B) for such events, and understand the rules for independent events, using P(A ∩ B) = P(A) × P(B).
  • The key ideas to know are Explain and Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

ExplainDescribe

Why it matters

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

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Practice Questions7 linked questions

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Paper 1 structured question: Probability

Paper 1Statistical Techniques2 marks

Description

Drawing balls from a bag

Event A: Drawing a red ball, P(A) = 0.4 Event B: Drawing a blue ball, P(B) = 0.6 Events A and B are mutually exclusive.

  1. a

    Calculate the probability of drawing a red or blue ball.

    Aim for approximately 2 distinct marking points.

    [2]
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