Say we have four sided dice (sides of 1, 2, 3, and 4, and each side is equally likely). A pair of four sided dice are to be rolled. Let X denote the sum of the two numbers that show up, and let Y denote the absolute value of their difference. a. Compute the joint probability mass function of X and Y, f(x, y) = P(X = x, Y = y) (Hint: X can be 2,3,4,5,6,7,8 and Y can be 0,1,2,3). Create a table. b. Compute the marginal pmfs of X and Y. Create tables. c. Find the conditional pmf of X given Y=0. Create table. d. Compute the expectation of X, E(X) and the expectation of Y, E(Y). e. Compute E(XY). f. Compute the covariance of X and Y, cov(X,Y). g. Are X and Y independent? Why or why not.

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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Say we have four sided dice (sides of 1, 2, 3, and 4, and each side is equally likely). A pair of
four sided dice are to be rolled. Let X denote the sum of the two numbers that show up, and let Y
denote the absolute value of their difference.
a. Compute the joint probability mass function of X and Y, f(x,y) = P(X = x,Y = y) (Hint: X
can be 2,3,4,5,6,7,8 and Y can be 0,1,2,3). Create a table.
b. Compute the marginal pmfs of X and Y. Create tables.
c. Find the conditional pmf of X given Y=0. Create table.
d. Compute the expectation of X, E(X) and the expectation of Y, E(Y).
e. Compute E(XY).
f. Compute the covariance of X and Y, cov(X,Y).
g. Are X and Y independent? Why or why not.
Transcribed Image Text:Say we have four sided dice (sides of 1, 2, 3, and 4, and each side is equally likely). A pair of four sided dice are to be rolled. Let X denote the sum of the two numbers that show up, and let Y denote the absolute value of their difference. a. Compute the joint probability mass function of X and Y, f(x,y) = P(X = x,Y = y) (Hint: X can be 2,3,4,5,6,7,8 and Y can be 0,1,2,3). Create a table. b. Compute the marginal pmfs of X and Y. Create tables. c. Find the conditional pmf of X given Y=0. Create table. d. Compute the expectation of X, E(X) and the expectation of Y, E(Y). e. Compute E(XY). f. Compute the covariance of X and Y, cov(X,Y). g. Are X and Y independent? Why or why not.
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