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Probability
Shares its weighting with Statistics, so together they are about a sixth of the paper at both tiers. Probability questions are often the most self-contained on the paper — a student can gain marks here without needing much else to be secure, which makes it a good early confidence win.
Probability and Statistics share this weighting between them. Weightings are approximate and vary slightly by board. They describe the whole tier rather than any single paper.
The probability scale
Notation and describing likelihood
Coming soonFound. & HigherProbability of single events
Working from equally likely outcomes
Coming soonFound. & HigherRelative frequency
Experimental probability
Coming soonFound. & HigherExpected outcomes
Predicting results over many trials
Coming soonFound. & HigherSample space diagrams
Listing all possible outcomes
Coming soonFound. & HigherTwo-way tables
Reading and completing them
Coming soonFound. & HigherFrequency trees
Organising counts through two stages
Coming soonFound. & HigherTree diagrams
Independent events with replacement
Coming soonFound. & HigherMutually exclusive events
Probabilities that sum to one
Coming soonFound. & HigherVenn diagrams and set notation
Union, intersection and complement
Coming soonFound. & HigherConditional probability
When one event affects another
Coming soonHigher onlyTree diagrams without replacement
Changing denominators between stages
Coming soonHigher onlyProbability from Venn diagrams
Conditional questions from a diagram
Coming soonHigher onlyNeed this section explained properly?
Small groups of no more than 5, arranged by ability. Founding member price £35 a lesson, held for the first year. The first lesson is a free trial.