[問題] SOA_P sample裡的幾題請教大家
感謝前面的人給我一點信心.但是這次我又有問題了XD
同樣也是sample裡的問題想請教大家
A machine consists of two components, whose lifetimes have the joint pdf.
f(x,y)=1/50, x>0,y>0, x+y<10
The machine operates until both components fail. Calculate the expected
operational time of machine.
我認為由於題目是要算期望的運作時間.可是X和Y誰壽命比較都不知道.所以假設x>y
(相反也可以)
則題目所求自然就是壽命比較長的E(X).可是答案算出來是2.5
則解答是5
請大家幫我看看,謝謝!
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推
05/08 17:37, , 1F
05/08 17:37, 1F
→
05/08 17:38, , 2F
05/08 17:38, 2F
→
05/08 17:38, , 3F
05/08 17:38, 3F
推
05/08 17:39, , 4F
05/08 17:39, 4F
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