A dart is thrown at a board with radius 7. the point the dart hits is uniformly distributed on the cricular board. Find the expected distance of the point from center of board. The answer uses the survival function but I do not how exactly. I am not a mathematician and need help. I just like math thats all. It says s(t)= T>t= Pr (X^2 +Y^2 > t^2) = area of circle with r=7-area pfcircle with r=t/ area of circle with r=7. I am lost ......

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