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Guest
Guest
hi im new to all this. how would i do probablty wit a dart board thats R=9in & r=5in. please help i cant figure this out.
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Guest
Guest
it has five annular rings. i still dont understand how 2 get the probablilty of each ring.
You (should) know that
area of a circle = pi*r^2
If you think about those darts sailing thru the air, the bigger the area you have to hit in the more likely you are to hit it, yes? Unless there is more info hiding in in the problem you have to assume that you will hit the target somewhere. Start with the largest to get a basis. Then move to the smallest. The smallest area divided by the largest (the " universe") is the probability of hitting the smallest. The difference of that ring area and the next bigger area is the probability of hitting the next ring. You continue doing that. If you look at the result you will see that the sum of those probabilities = 1 (You are certain to hit something.)
area of a circle = pi*r^2
If you think about those darts sailing thru the air, the bigger the area you have to hit in the more likely you are to hit it, yes? Unless there is more info hiding in in the problem you have to assume that you will hit the target somewhere. Start with the largest to get a basis. Then move to the smallest. The smallest area divided by the largest (the " universe") is the probability of hitting the smallest. The difference of that ring area and the next bigger area is the probability of hitting the next ring. You continue doing that. If you look at the result you will see that the sum of those probabilities = 1 (You are certain to hit something.)