→ jimmy86204:我想他應是秩序統計量的jpdf 先做出X1 X2~iid U(0,L) 12/19 00:17
→ jimmy86204:再做X1,X2的jpdf 最後做order 直接*2! 12/19 00:17
→ force5566:可是不是獨立可以這樣做嗎？ 12/19 22:27
→ jimmy86204:at two random spots << 我想這意思就是獨立了-.- 12/19 22:42
題目:
A bar or length L is broken into three pieces at two random spots.
What is the probability that the length of at least one piece is less
than L/20 ?
< SOL >
---------- ------- -------------
0 X Y L
我不懂為什麼 結合密度函數 fxy 是2/L^2
接下來就一樣討論範圍就不打了~~
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