Problem 6.1 (Video 4.1 - 4.7, Lecture Problem) Let X be Uniform[1, 2]. Let Y given X = x be Exponential(x); that is, fy|x(y|x) = xexy, y ≥ 0 and 0, y < 0. (a) Find the expected value of Y. (Hint: see HW 5, problem 5.4e). (It is OK to leave your answer as an integral.) (b) Find the conditional expected value E[Y|X = x] of Y given X = x. (This should be in closed form.) (c) Using E[Y] = E[E[Y|X]] find the expected value of Y. (This should be in closed form.) (d) Solve for E[XY].

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Problem 6.1 (Video 4.1 - 4.7, Lecture Problem) Let X be Uniform[1, 2]. Let Y given
X = x be Exponential(x); that is, fy|x(y|x) = xexy, y ≥ 0 and 0, y < 0.
(a) Find the expected value of Y. (Hint: see HW 5, problem 5.4e). (It is OK to leave your
answer as an integral.)
(b) Find the conditional expected value E[Y|X = x] of Y given X = x. (This should be in
closed form.)
(c) Using E[Y] = E[E[Y|X]] find the expected value of Y. (This should be in closed form.)
(d) Solve for E[XY].
Transcribed Image Text:Problem 6.1 (Video 4.1 - 4.7, Lecture Problem) Let X be Uniform[1, 2]. Let Y given X = x be Exponential(x); that is, fy|x(y|x) = xexy, y ≥ 0 and 0, y < 0. (a) Find the expected value of Y. (Hint: see HW 5, problem 5.4e). (It is OK to leave your answer as an integral.) (b) Find the conditional expected value E[Y|X = x] of Y given X = x. (This should be in closed form.) (c) Using E[Y] = E[E[Y|X]] find the expected value of Y. (This should be in closed form.) (d) Solve for E[XY].
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