Find the followings:
a). E(X + 2Y )
b).E(4Y − 3X)
c). E(X2 )
For the following parts, suppose X and Y are independent.
d). V ar(−2Y )
e). V ar(X + Y )
f). V ar(2X − 3Y )
g). SD(X − Y )
h). SD(3X + 4Y )
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