An introduction to tree diagrams (level 7-8)

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Presentation transcript:

An introduction to tree diagrams (level 7-8) LO:- Must be able to calculate probability of an event happening and not happening. Should be able to draw a tree diagram. Could be able to calculate probabilities from a tree diagram.

Example question. Sam has a bag. In this bag be puts 6 blue balls and 4 red balls. What is the probability of getting a red ball? P( red) = 4/10

OUTCOMES Sam picks one ball and records the colour and puts it back. He then picks a second ball and records the colour. What are all the possible outcomes? First pick Second pick

Tree diagram

Now try this Question Find P(red)= P(green) = Now draw a tree diagram