1. Two discrete random variables X and Y have the joint PMF given by (0.2 x = -1,y = 0 |0.1 x = -1,y = 1 0.1 x = 0,y = 0 Pxy (x, y) = { 0.2 x = 0,y = 1 0.1 x = 1, y = 0 0.3 x = 1, y = 1 0o therwise Determine the followings: a) the marginal PMFS of X and Y (i.e., px(x),py(y)) b) the conditional PMF of X given Y, px|y (x|y) c) whether X and Y are independent.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
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1. Two discrete random variables X and Y have the joint PMF given by
(0.2 x = -1,y = 0
0.1 x = -1,y = 1
0.1 x = 0, y = 0
0.2 x = 0, y = 1
0.1 x = 1, y = 0
0.3 x = 1, y = 1
Pxr (x, y) =
0 o therwise
Determine the followings:
a) the marginal PMFS of X and Y (i.e., px(x), py(y))
b) the conditional PMF of X given Y, px|y (x|y)
c) whether X and Y are independent.
d) What is the covariance of X and Y?
e) Find pxy and determine whether or not X and Y are uncorrelated.
Transcribed Image Text:1. Two discrete random variables X and Y have the joint PMF given by (0.2 x = -1,y = 0 0.1 x = -1,y = 1 0.1 x = 0, y = 0 0.2 x = 0, y = 1 0.1 x = 1, y = 0 0.3 x = 1, y = 1 Pxr (x, y) = 0 o therwise Determine the followings: a) the marginal PMFS of X and Y (i.e., px(x), py(y)) b) the conditional PMF of X given Y, px|y (x|y) c) whether X and Y are independent. d) What is the covariance of X and Y? e) Find pxy and determine whether or not X and Y are uncorrelated.
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