Unformatted text preview: (b) E(x) = 7/12 (c) V(x) = 3/4 – (7/12) 2 (d) COV(x,y) = 19/144 4. (a) V(x+y)=V(x)+V(y)=2+8=10 (b) E(z+w) = 34 (c) COV(z,w) = E(zw)  E(z)E(w) = E(10x 2 + 21xy +2y 2 ) + E(10x+y) +E(x+2y) = 56...
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 Spring '08
 Rodriguez
 Statistics, Probability, David Gri tz, David Gri

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