Prob and Stat Homework 7
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Prob and Stat
Homework 7
Problem 1
Suppose (X, Y) has a joint pdf f (x, y) = e −xI{0<y<x<∞} . Find fX (x) and fX |Y (x|y).
Problem 2
A pdf is defined by
fXY (x, y) = c(x + 2y), 0 < y < 1, 0 < x < 2.
(a) Find the value of c. (b) Find the joint cdf of X and Y. (c) What is P(X > )?
Problem 3
Find P(X > ) if X and Y are jointly distributed with pdf
fXY (x, y) = (x + y), 0 ≤ x ≤ 1, 0 ≤ y ≤ 1.
Find P(X2 < Y < X) if X and Y are jointly distributed with pdf
fXY (x, y) = 2x, 0 ≤ x ≤ 1; 0 ≤ y ≤ 1.
Problem 4
Suppose the distribution of Y, conditional on X = x, is N(x, x2) and that the marginal distribution of X is uniform(0,1). Derive the density of (X, Y).
2021-12-25