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Flip to reveal answersWhat goes on the branches of a tree diagram?
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All 9 Flashcards — Tree diagrams
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Question
What goes on the branches of a tree diagram?
Answer
The probability of each outcome at that stage.
Question
How do you find the probability of a path?
Answer
Multiply the probabilities along the branches of that path.
Question
What do the branches leaving one point sum to?
Answer
1.
Question
How do you find the probability of an event with several paths?
Answer
Find each path (multiply along it) and add the matching paths.
Question
What changes for 'without replacement' on a tree?
Answer
The second-stage probabilities use reduced totals (one fewer item, one fewer of that type).
Question
With replacement vs without — branch probabilities?
Answer
With replacement they repeat each stage; without, they change.
Question
Fast method for 'at least one'?
Answer
1 − P(none).
Question
Bag of 3 red, 2 white, drawn with replacement: P(red then red)?
Answer
(3/5)(3/5) = 9/25.
Question
Same bag without replacement: P(red then red)?
Answer
(3/5)(2/4) = 3/10.
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Full study notes for Tree diagrams
Topic 4.6 hub
Combined & conditional events
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Math AA SL exam skills
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