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???????? ? 17 ?. ??????? http://math.shekou.com ???. ??????. ????????? X ? Y ??????????????????? cov( X , Y ) ? , cov( X , Y )= E {[ X - E ( X )][ Y - E ( Y )]}= = E [ XY - XE ( Y ) - YE ( X )+ E ( X ) E ( Y )]= = E ( XY ) - E ( X ) E ( Y ) - E ( Y ) E ( X )+ E ( X ) E ( Y )=

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Xy xe - PowerPoint PPT Presentation

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