Let {Xi} be any i.i.d. r.v. with finite 2nd moment, then ......
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送交者: LaoXiao 于 2009-05-30, 20:50:43:
回答: 是么？=0, =0 由 wasqaz 于 2009-05-30, 18:25:56:
Let {Xi} be any i.i.d. r.v. with finite 2nd moment, then {Xi-E(X)} will meet this condition.
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