Tree Diagrams
(KS3, Year 7)
A Real Example of a Tree Diagram
It is easier to understand a tree diagram with an example.Tossing a Coin
If a coin is tossed, the coin can land on Heads or Tails.- Each outcome has its own branch. There is a branch for Heads and for Tails.
- The probability of each outcome is written by each branch. The probability of Heads (^{1}⁄_{2}) is written by the branch. The probability of Tails (^{1}⁄_{2}) is written by the branch.
Another Real Example of a Tree Diagram
A tree diagram can be extended to more than one event. The tree diagram below is for two coin tosses.What Is Probability?
A probability is a measure of how likely (how probable) an event is to happen. A probability is expressed as a number between 0 (impossible) and 1 (certain). The formula for finding a probability is shown below:Worksheet
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