Which Team Will Win? Think back to this previous lesson where we compared frequency trees with a probability tree diagram:

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Presentation transcript:

Which Team Will Win? Think back to this previous lesson where we compared frequency trees with a probability tree diagram:

Which Team Will Win? We can rewrite the frequency tree as a probability tree diagram: 16 16 24 Y 24 24 36 Y 8 8 24 B 8 8 12 Y 12 36 12 B 4 4 12 B

Which Team Will Win? What are the differences between the two diagrams? 16 16 24 Y 24 24 36 Y 8 8 24 B 8 8 12 Y 12 36 12 B 4 4 12 B

Which Team Will Win? Where do the fractions come from in the second diagram? 16 16 24 Y 24 24 36 Y 8 8 24 B 8 8 12 Y 12 36 12 B 4 4 12 B

Which Team Will Win? Notice the fractions haven’t been cancelled down? What would they be if they were? How does this relate to the dice we used? 16 24 16 Y 24 24 36 Y 8 24 8 B 8 12 8 Y 12 36 12 B 4 4 12 B

Which Team Will Win? We can use the tree diagram to find probabilities by multiplying the fractions on the branches. 2 3 Y 2 3 Y 1 3 B 2 3 Y 1 3 B 1 3 B

Which Team Will Win? On your whiteboards: What is the probability of the Yellow team scoring twice? 2 3 Y 2 3 Y 1 3 B 2 3 Y 1 3 B 1 3 B

Which Team Will Win? On your whiteboards: What is the probability of the Blue team scoring twice? 2 3 Y 2 3 Y 1 3 B 2 3 Y 1 3 B 1 3 B

Which Team Will Win? On your whiteboards: What is the probability of the Yellow team scoring once? Why is this different? 2 3 Y 2 3 Y 1 3 B 2 3 Y 1 3 B 1 3 B

Which Team Will Win? On your whiteboards: What is the probability of the Yellow team scoring at least once? Can you answer this in more than one way? 2 3 Y 2 3 Y 1 3 B 2 3 Y 1 3 B 1 3 B

Here is a partially filled tree diagram What is different about this tree diagram?

Here is a partially filled tree diagram What do you think this tree diagram is about?

Here is a partially filled tree diagram What questions could be asked about this tree diagram? Think of as many as you can and write them on your whiteboards. Choose some questions from around the room and ask students to find the answers on their whiteboards.