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Probability: Numerical Outcome

Probability: Numerical Outcome

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Please how do you arrive to the following 
A = 10   P(A) = 0.5
B = 20  P(B) = 0.4
C = 100  P(C) = 0.1
I am confused with regards to how you got the probability of A, B, C ( P(A), P(B), P(C) ). Please explain.

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Super Learner
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Hello Sandra, I was wondering about this question too. I know how they calculate the probability though. I am assuming they are calculating the geometric probability.  I won’t go into detail about how to calculate it but you use the radius to calculate the area of the corresponding circle on the target; you want to find the area of each ring on your target and use that area as the denominator of your probability formula. You can google ‘geometric probability on a target’ for a full explanation. Sorry picture will not increase in size for this post. I was wondering how they came up with with the values associated to the letters. In other words A= 10 of what?

Hello John, Thanks for the reply but i would love if you go into details like show your work. It will be very helpful to me. Thanks

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