Learning objective

Compute probabilities in straightforward scenarios, including selections made with or without replacement. Probabilities may be expressed as fractions, decimals, or percentages, and knowledge of permutations and combinations is not necessary.

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 compute probabilities in straightforward scenarios, including selections made with or without replacement. Probabilities may be expressed as fractions, decimals, or percentages, and knowledge of permutations and combinations is not necessary.
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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0 of 5 attempted

Paper 1Statistical Techniques2 marks

Description

A bag contains 4 red balls and 6 blue balls. A ball is drawn at random, noted, and then replaced. Another ball is drawn.

a
Calculate the probability of drawing a red ball on the first draw.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Calculate the probability of drawing a blue ball on the second draw, given that the first ball drawn was red and replaced.
Your answer
Aim for approximately 1 distinct marking point.
[1]

Revision notestopic notes

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