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Mathematics · GCSE
What the Average Hides
Why 'without replacement' changes the whole calculation, and when the mean is the wrong average to quote. Probability with a tree diagram drawn without replacement; which average and why, with a box plot; samples, charts, Venn diagrams and correlation; six questions to ask before you calculate anything; a worked probability without replacement. Twelve terms to define, a model answer on a mean far above a median, and the misconceptions that cost marks.
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