GCSE Maths (AQA)

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Conditional Probability from Tree Diagrams

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Probability Probability

Conditional Probability from Tree Diagrams

5:27 Conditional Probability
Spec P9
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  • Conditional probabilities can be calculated from tree diagrams
  • Frequency tree diagrams show the frequency of events resulting from random actions
  • Conditional probabilities can be calculated by dividing the frequency at the end of a branch by the frequency at the start
  • Probability tree diagrams show the probability of events happening given the events on the branches before
  • Conditional probabilities can be read directly from probability tree diagrams
  • Conditional probabilities can be calculated by multiplying the probabilities along the path leading to the specific series of events on the diagram
  • The probability of event A occurring given that event B has already occurred can be written as P(A|B)

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