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Compute value of the expressions

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Suppose that X, Y and Z are jointly distributed random variables, that is, they are defined on the same sample space.

Suppose also that
E(X)=5 E(Y)=-6 E(Z)=-8
Var(X)=31 Var(Y)=14 Var(Z)=2
Compute the values of the expressions below.

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The expert computes the value of an expression. Jointly distributed random variables are examined.

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