問題詳情
18 設一連續隨機變數 X 具有機率密度函數 
，求其變異數（variance）？
(A) 1/18
(B) 1/36
(C) 3/18
(D) 5/36 2(1 − x), 0 < x < 1
參考答案
無參考答案
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