一產品壽命 ( 單位：小時 ) X 的機率密度函數為，試問該產品壽命超過1000小時的機率是多少？(A) e-1 (B) (C) (D)

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21. 一產品壽命 ( 單位：小時 ) X 的機率密度函數為，試問該產品壽命超過1000小時的機率是多少？
(A) e-1
(B)
(C)
(D)

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