Former? =DX+(EX)？ = 1+ 1=2

EY？ =DY+(EY)？ =4+4=8

ρ(XY)=Cov(X，Y)/√(DXDY)=(EXY-EXEY)/2

Therefore exy = 2ρ (xy)+exy =1.2+2 = 3.2.

So EZ=4EX? -4EXY+EY？ +4EX-2EY+ 1

=8- 12.8+8+4-4+ 1

=4.2

You can ask questions if you don't understand. If it helps, please choose the satisfactory answer!