Edexcel Maths Probability Revision Notes
Master Edexcel 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. An event with a probability of 0 will never happen, while an event with a probability of 1 is certain to happen. Understanding probability is essential for making informed decisions in uncertain situations.
Key Concepts
- 1Probability is calculated as the number of successful 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 do not affect each other's probabilities, while dependent events do.
- 4The probability of the complement of an event is 1 minus the probability of the event.
- 5Common probability distributions include binomial, normal, and geometric distributions.
Simple Explanation
Probability helps us understand how likely something is to happen. If you flip a coin, there's a 50% chance it will land on heads and a 50% chance it will land on tails. We can calculate probability by looking at how many times something can happen compared to all the possible outcomes. So, if there are 10 different outcomes and 2 of them are what we're interested in, the probability is 2 out of 10, or 0.2.
Memory Trick
“Remember the phrase 'Probability is Possible Outcomes over Total Outcomes' (P = PO/TO) to help recall how to calculate probability.”
Flashcards
What is the probability of getting a head when flipping a fair coin?
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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.
Explain how to calculate the expected value of a discrete random variable. [4 marks]
4 marksView mark scheme hint▾
Define expected value, show the formula, and explain its significance.
What is meant by mutually exclusive events? [2 marks]
2 marksView mark scheme hint▾
Define mutually exclusive events and provide an example.
Practice Quiz
What is the probability of rolling a 3 on a fair six-sided die?
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