W4109: PROBABILITY & STATISTICAL INFERENCE Fall 2008 ...
W4109: PROBABILITY & STATISTICAL INFERENCE Fall 2008 ...
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