Probability Trees


a tree diagram can be used to show probabilities of events. the diagram looks like the branches of a tree.

  • the probability of each event should be marked on each branch.
  • the probabilities on each set of branches must always add up to 1.

Key Skills

  • draw a tree diagram to illustrate probability experiments.
  • use tree diagrams to calculate probabilities of events occurring.


tree diagramprobability.