2.9 Exercises 44
2.17 Demonstrate using an example that in general, for dependent random
variables,E[XY] =E[X]E[Y] does not hold.
2.18 Prove Proposition 2.8.
Hint Argue thatX(ω) =
∫
[0,∞)I{[0,X(ω)]}(x)dxand exchange the integrals.
Use the Fubini-Tonelli theorem to justify the exchange of integrals.
2.19Prove Theorem 2.12.
2.20Prove Theorem 2.14.