— _____________ .— I agree with you.选择一项:A. I thin

— _____________ .— I agree with you.选择一项:A. I think we should bring back death p

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设X1,X2,…,Xn是总体N(u,02)的样本,X是样本均值,记S2=. . . . . . .

设X1,X2,…,Xn是总体N(u,02)的样本,X是样本均值,记S2=. . . . . . . . , , . . , - "isl s=x-a2,则服从自

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