Let Y, and Y2 have a joint density function given by [3y1 0 < y2 < y1 S 1 elsewhere. 3.1.3. Let Y, and Y, denote random variables. Use the formula E (Y,) = E[E(Y,|Y½)] to find E (Y2). " 3.1.4. Use the marginal density function of Y2 to find E(Y2) to verify the answer in (3.1.3.).
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