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Hard tree diagram word problem help
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shainaaa14
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#1
Some of the children at the school arrive by car.
- 60% of the children at school are boys
- 20% of the boys arrive at school by car
- 60% of the girls at school arrive by car
What is the probability a child chosen at random at school arrives by car?
Please help!!!
- 60% of the children at school are boys
- 20% of the boys arrive at school by car
- 60% of the girls at school arrive by car
What is the probability a child chosen at random at school arrives by car?
Please help!!!
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nzy
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shainaaa14
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#3
(Original post by nzy)
Have you drawn the tree diagram?
Have you drawn the tree diagram?
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nzy
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#4
If you've filled in the probabilities for each branch of the diagram, do you know how to calculate the probability that a chosen student is a boy who travels to school by car, for example?
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shainaaa14
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#5
(Original post by nzy)
If you've filled in the probabilities for each branch of the diagram, do you know how to calculate the probability that a chosen student is a boy who travels to school by car, for example?
If you've filled in the probabilities for each branch of the diagram, do you know how to calculate the probability that a chosen student is a boy who travels to school by car, for example?
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nzy
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#6
Multiplying the probability along each branch of the diagram will give you the overall probability of that 'path'.
So, for a the student to be a boy who arrives at school by car, you'd need to multiply the probability that the student is a boy with the probability that a boy arrives by car.
So, for a the student to be a boy who arrives at school by car, you'd need to multiply the probability that the student is a boy with the probability that a boy arrives by car.
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the bear
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#7
so you do not actually need to use a tree ? a 2 way table might be easier.
also you can choose a number for the total pupils....1000 is probably convenient ( it does not matter if it does not seem like a real world amount of pupils etc
)
also you can choose a number for the total pupils....1000 is probably convenient ( it does not matter if it does not seem like a real world amount of pupils etc
)
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