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EX=∫(上+∞下θ)xf(x,θ)dx=∫(上+∞下θ)xe^[-(x-θ)]dx =-(xe^[-(x-θ)]|(上+∞下θ)-∫(上+∞下θ)e^[-(x-θ)]dx) =-θ-1=µ; θ=-µ;-1 θ^=- ̄X-1(X左邊橫線在X上方) 其中 ̄X=1/n∑(從1到n)Xi
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