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JCECE Engineering JCECE Engineering Solved Paper-2012

  • question_answer
    Let \[X\] and \[Y\] be two random variables. The relationship \[E(XY)=E(X)\cdot E(Y)\] holds

    A)  always

    B)  if\[E(X+Y)=E(X)+E(Y)\]is true

    C)  if \[X\] and \[Y\] are independent

    D)  if \[X\] can be obtained from \[Y\] by a linear transformation

    Correct Answer: C

    Solution :

    We know that the relationship -                \[E(XY)=E(X)\cdot E(Y)\]holds, when X and Yare independent variables.


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