GCSE›AQA GCSE Maths›Mind mapsBasic ProbabilityAQA GCSE Maths: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsThe scaleProbabilities lie from 0 to 1Write as fractions, decimals or percentages0 = impossible, 1 = certainOutcome: a possible result of an experimentSets of outcomesExhaustive: covers every possible outcomeMutually exclusive: cannot happen togetherExhaustive outcomes sum to 1P(not A)=1−P(A)P(\text{not } A) = 1 - P(A)P(not A)=1−P(A)Relative frequencysuccessful trialstotal trials\frac{\text{successful trials}}{\text{total trials}}total trialssuccessful trialsBased on experimental resultsMore trials → closer to theoretical probabilityTheoretical: from equally likely outcomesProbabilitythe basics00.51Expected outcomesExpected = probability × trialsFair coin, 50 tosses: 50×0.5=50 \times 0.5 =50×0.5= 25 headsOnly a prediction, not a guaranteeListing outcomesTables and frequency trees record resultsPossibility space lists every outcomeTwo dice give 36 equally likely outcomesVenn diagrams help list setsExam tipsDraw the 6×6 grid for two diceCount favourable ÷ total outcomesMissing probability: subtract others from 1