(13) Let E (X|Y = y) = 3y and var(X|Y = y) = 2, and let Y have the p. d.f. re-y if y > 0 f(y) = lo otherwise Then the variance of X is: (a) 1 (b) 11 (c) 2 (d) 12
(13) Let E (X|Y = y) = 3y and var(X|Y = y) = 2, and let Y have the p. d.f. re-y if y > 0 f(y) = lo otherwise Then the variance of X is: (a) 1 (b) 11 (c) 2 (d) 12
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Transcribed Image Text:(13) Let E(X|Y = y) = 3y and var(X|Y = y) = 2, and let Y have the p.d. f.
if y > 0
f(y):
l0 otherwise'
Then the variance of X is:
(a) 1
(b) 11
(c) 2
(d) 12
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