GCSE Maths (AQA)

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The Probability Scale

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Probability Probability

The Probability Scale

4:38 Theoretical Probability
Spec P3
Previous Events & Outcomes Next Theoretical Probability
  • Probability is a measure of how likely an event is to occur
  • Events are specific sets of outcomes that satisfy certain criteria
  • Probabilities are given as a number between 0 and 1
  • A probability of 1 means the event is certain, while a probability of 0 means the event is impossible
  • Events with a probability halfway between 0 and 1 have an even chance
  • Events that have a better than even chance of happening but aren't certain are likely
  • Events that have a less than even chance of occurring but are not impossible are unlikely
  • Probabilities can be written as decimals, fractions, or percentages
  • The terms likely and unlikely are vague and do not refer to a specific probability
  • It is unlikely that you would be asked to describe a numerical probability in words at GCSE, but you should be comfortable using numbers and the probability scale for calculations.

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