We have,
E(X)=4, E(Y)= -2 , Var(X)=0.3 , Var(Y)=0.5
Cov(XY)=0.03
Now
E(5X-3Y)= E(5X) - E(3Y)
= 5*E(X) - 3*E(Y)
= 5*4 - 3*(-2)
=20 - (-6)
= 20+6
= 26
E(5X-3Y)= 26.00
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