GCSE Statistics Chapter 7 Summary- Probability

After completing this chapter, you will be able to;

  • Understand the meanings of the words ‘event’ and ‘outcome’
  • Use a likelihood scale
  • Put outcomes in order in terms of probability
  • Put probabilities in order on a probability scale
  • Understand the terms ‘random’, ‘equally likely’, ‘mutually exclusive’ and ‘exhaustive’.
  • Understand and use measure of probability from a theoretical perspective and from a limiting frequency or experimental approach
  • Compare expected frequencies and actual frequencies
  • Use simulation to estimate more complex probabilities
  • Use probability to assess risks
  • Produce, understand and use a sample space
  • Understand and use the addition and multiplication laws
  • Use and calculate conditional probabilities
  • Draw and use probabilities tree diagrams. 
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Events and outcome

1.) A trial is the act of testing/ doing something.

2.) Outcomes are the possible results of a trial.

3.) An event is a set of one or more successful outcomes.

The meaning of probability

4.) Probability is a numerical measure of the chance of an event…

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14.) A Venn diagram represents a sample space and may be used to calculate
probabilities. Set =s are represented as circles and common elements of the set
are represented by the areas where the circles overlap.

Mutually exclusive events

15.) Outcomes/ events are mutually exclusive if they cannot happen at…

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Tree diagrams

26.) A tree diagram can be used to make calculations easier. Each branch of
the tree represents an outcome. The probability of thee outcome is written on the

27.) Sometimes one branch of a tree may end earlier than others.

Conditional probability

28.) Conditional probability is the…


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