GCSE · Basic probability

Relative frequency & expected outcomesExam-style questions

Estimating a probability from data — relative frequency is frequency divided by the number of trials — why more trials sharpen the estimate, how to test a dice or spinner for bias, and why the expected number is probability times trials.

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13 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAll Level 1 Level 2 Level 3 Level 4 Level 5

1
A spinner is spun $50$ times. It lands on red $20$ times. Work out the relative frequency of red.
Level 1 · 1 markTry it
2
The probability that a biased coin lands heads is $0.6$ . The coin is flipped $200$ times. Estimate how many times it lands heads.
Level 1 · 1 markTry it