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probability scaleProbability is a way of assessing chance, likelihood or risk. It may be quoted as a decimal, fraction or percentage. The probability of an impossible event is 0 and the probability of a certain event is 1. All other probabilities are between 0 and 1.
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Glossary

event

any set of possible outcomes of a statistical experiment

fraction

A ratio of two numbers or polynomials.

union

The union of two sets A and B is the set containing all the elements of A and B.

Full Glossary List

This question appears in the following syllabi:

SyllabusModuleSectionTopic
AQA GCSE (9-1) Foundation (UK)P: ProbabilityP1: Frequencies in Tables and TreesBasic Probability Problems
CBSE IX (India)ProbabilityExperimentsRepeated experiments
CBSE X (India)Statistics and ProbabilityProbabilityDefinition
CIE IGCSE (9-1) Maths (0626 UK)8 ProbabilityC8.1 Calculating a ProbabilityBasic Probability Problems
Edexcel GCSE (9-1) Foundation (UK)P: ProbabilityP1: Frequencies in Tables and TreesBasic Probability Problems
GCSE Foundation (UK)ProbabilityProbabilityBasic problems
OCR GCSE (9-1) Foundation (UK)11: Probability11.01d: Equally Likely Outcomes and ProbabilityBasic Probability Problems
Universal (all site questions)PProbabilityBasic problems