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GCSE Mathematics · key term
An outcome or collection of outcomes whose probability is being considered.
Used by AQA, Edexcel and OCR
Specification P4, P7 · Paper 1, Paper 2, Paper 3
A result or group of results whose probability is being considered.
Revise: Sum of ProbabilitiesA probability describes how likely an event is. It lies between 0 (impossible) and 1 (certain). An outcome is one possible result of a trial: on a single coin toss, the outcomes are heads and tails.
A collection of outcomes satisfying a stated condition, such as obtaining a total of 7.
Check that the events cover every possible outcome before subtracting their probabilities from 1.
Mutually exclusive does not mean exhaustive: two events can be unable to happen together while leaving other outcomes unaccounted for.
If two events can happen in the same trial, do not add their probabilities and assume the total is 1.
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Specification P3, P4, P7 · Paper 1, Paper 2, Paper 3
A result or collection of results whose likelihood is being considered, such as rolling an odd number.
Revise: Relative Expected FrequenciesProbability describes how likely an event is to happen.
A collection of one or more outcomes from a probability experiment.
Specification 11.02e, 11.02f · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A collection of outcomes of a random experiment.
Revise: Addition LawAn event is a set of outcomes, such as rolling an even number on a fair six-sided die. The probability of an event tells us how likely it is, from 0 (impossible) to 1 (certain). In probability, A or B includes outcomes in A, in B, or in both.