Statistics & Probability

Statistics & Probability

1. A good way of showing statistics and probability is through a tree diagram

2. Here is an example of a tree diagram

3. Tree diagrams allow us to see all the possible outcomes of an event and calculate their probability.

4. Each branch in a tree diagram represents a possible outcome

5. If two events are independent, the outcome of one has no effect on the outcome of the other.

6. if we toss two coins, getting heads with the first coin will not affect the probability of getting heads with the second.

7. From the tree diagram, we can see that there are eight possible outcomes. To find out the probability of a particular outcome, we need to look at all the available paths (set of branches).

8. The sum of the probabilities for any set of branches is always 1.

9. in a tree diagram to find a probability of an outcome we multiply along the branches and add vertically.

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