[請益] 各位大大好 想請教113財金考題 統計概念
各位大大好!!
這次考完113財金 經濟考完的時候 想說 好簡單 穩上XD
結果統計考完....就知道不可能上了@@ 幾乎看不懂ORZ
希望可以向各位大大們請教一個統計小概念
f(x,y)= x+y for 0<= x <= 1 , 0<= y <= 1
0 otherwise
題目是要找條件期望值 這些我覺得都會 練考古也沒問題 但是這邊卡住了....
如果要找f(x) 就是要 ∫f(x,y)dy ,悲劇的是 此刻我卡住了 突然傻的全都不會
發現之前都只做過離散型 或是連續行 但沒有加法的(例如f(x,y)=xy)
因此最後想說不管x 直接對y積分 最後做出了x+0.5y^2 ... 自己都不知道這在寫什麼
100%錯... 希望各位大大們能幫小的解答這個想法 真的很感謝!
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