AQA Maths Probability Revision Notes
Master AQA Maths Probability using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Probability is the measure of how likely an event is to occur, expressed as a number between 0 and 1. A probability of 0 means the event cannot happen, while a probability of 1 means it is certain to happen. Understanding probability is essential for making predictions and informed decisions.
Key Concepts
- 1Probability is calculated as the number of favorable outcomes divided by the total number of possible outcomes.
- 2The sum of probabilities of all possible outcomes of a random experiment is always 1.
- 3Independent events have probabilities that do not affect each other.
- 4Conditional probability is the probability of an event occurring given that another event has already occurred.
- 5The addition rule and multiplication rule are key for calculating probabilities in different scenarios.
Simple Explanation
Probability tells us how likely something is to happen. If you have a bag of marbles and you want to know the chance of picking a red one, you count how many red marbles there are compared to the total number of marbles. The more red marbles you have, the more likely you are to pick one. Probability helps us make predictions based on what we know.
Memory Trick
“Remember 'P = F/T' where P is Probability, F is Favorable outcomes, and T is Total outcomes. This helps you recall how to calculate probability.”
Flashcards
What is the probability of an event?
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Exam Questions
Describe and explain the concept of conditional probability. [6 marks]
6 marksView mark scheme hint▾
Define conditional probability, provide the formula, and give an example of its application.
Explain how the addition rule is applied in probability problems. [4 marks]
4 marksView mark scheme hint▾
State the addition rule and provide a simple example to illustrate it.
What is meant by independent events in probability? [2 marks]
2 marksView mark scheme hint▾
Define independent events and give a brief example.
Practice Quiz
What is the probability of rolling a 3 on a fair six-sided die?
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