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设ξ~N(a<sub>1</sub>,σ<sub>1</sub><sup>2</sup>),η~N(a<sub>2</sub>,σ<sub>2</sub><sup>2</sup>),(ξ<sub>1</sub>,ξ<sub>2</sub>…,ξ<sub>m</sub>)为ξ的样本,(η<