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W4109: PROBABILITY & STATISTICAL INFERENCE Fall 2008 ...

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17. DeGroot & Schervish. Suppose that X and Y are random variables such that<br />

(X, Y ) must belong to the rectangle 0 ≤ x ≤ 3 and 0 ≤ y ≤ 4. Suppose also that the<br />

joint c.d.f. of X and Y for every (x, y) in the rectagle is as follows:<br />

Determine<br />

F (x, y) = 1<br />

156 xy(x2 + y).<br />

(a) P(1 ≤ X ≤ 2 and 1 ≤ Y ≤ 2);<br />

(b) P(2 ≤ X ≤ 4 and 2 ≤ Y ≤ 4);<br />

(c) the c.d.f. of Y ;<br />

(d) the joint p.d.f. of X and Y ;<br />

(e) P(Y ≤ X).<br />

4

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