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 a measure of how likely an event is to occur, expressed as a number between 0 and 1. It is a fundamental concept in statistics and helps in making informed decisions based on uncertainty.
Key Concepts
- 1Probability ranges from 0 (impossible event) to 1 (certain event).
- 2The sum of probabilities of all possible outcomes in a sample space is 1.
- 3Independent events have probabilities that do not affect each other.
- 4The probability of an event A occurring is calculated as P(A) = Number of favorable outcomes / Total number of outcomes.
- 5Conditional probability is the probability of an event occurring given that another event has already occurred.
Simple Explanation
Probability tells us how likely something is to happen. If you flip a coin, the chance of it landing on heads is 50%, or 0.5. You can think of it like a fraction, where the top number is how many ways something can happen, and the bottom number is all the possible outcomes. The closer the probability is to 1, the more likely it is to happen.
Memory Trick
“Remember the phrase 'Probability is Possible' to recall that probabilities range from 0 (impossible) to 1 (certain).”
Flashcards
What is the probability of rolling a 3 on a fair six-sided die?
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Exam Questions
Describe and explain the difference between independent and dependent events in probability. [6 marks]
6 marksView mark scheme hint▾
Define both types of events, give examples, and explain how their probabilities are calculated.
Explain how to calculate conditional probability and provide an example. [4 marks]
4 marksView mark scheme hint▾
Define conditional probability, provide the formula, and illustrate with a clear example.
What is meant by the term 'sample space' in probability? [2 marks]
2 marksView mark scheme hint▾
Define sample space and give an example of a sample space for a simple experiment.
Practice Quiz
What is the probability of drawing an Ace from a standard deck of cards?
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