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GCSE Statistics · key term
The outcome category being counted in a probability model. It need not be a desirable outcome.
Used by Edexcel
Specification 3p.11 · Paper 1, Paper 2
Revise: Characteristics of a binomial distributionA binomial distribution describes the number of successes in a fixed number of repeated trials. A trial is one repetition of an experiment, and a success is simply the outcome we choose to count. “Success” does not necessarily mean something good: a faulty item could count as a success if faults are what we are investigating.
Define what counts as a success and what X counts before choosing n and p.
Justify suitability using the context: fixed number of trials, success/failure categories, independence and constant probability of success.
The mean np need not be an integer, even though the number of successes must be.
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