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Re: [理工] probability
![](https://i.imgur.com/v3WmG.jpg)
: 沒什麼想法QQ
The CDF of random variable is
a x
F(w) = Pr(W<w) = 2 * ∫∫ 1/a^2 dydx = 1 - 1/w, w>1
0 x/w
Thus, the PDF of random variable is
f(w) = 1/w^2, w>1
Hint:
Y W=Y/X X=Y
↑ ∕ /
a│──────┐
│ ∕ @@ /│ . W=X/Y
│ ∕ / │.
│ ∕ / ##.│
│ ∕ / . │
│∕/ . │
│/. │
└───────→X
0 a
The CDF is the probability of sum of @@ and ## areas.
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08/03 23:25, , 1F
08/03 23:25, 1F
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