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    Graduate Given Cont.Joint PDF function find Covariance MATRIX

    Hello Buddies, I need to calculate "covariance matrix" of the given joint PDF function. Joint PDF is fx(x1,x2,x3)=2/3(x1+x2+x3) over S (x1,x2,x3), 0<xi<1, i=1,2,3 How can I calculte the Covariance Matrix? Thanks