Lss 5 8 Given The Following Probability Distribution For Variables X And Y P Xi

Q10. (LSS 5.8) Given the following probability distribution for variables X and Y.

P(Xi,Yi) 0.2 0.4 0.3 0.1

        X -100 50 200 300

        Y 50 30 20 20

Compute a. E(X) and E(Y ). b. σX and σY . c. σXY . d. E(X+Y). e. By looking at the joint distribution, do you expect the correlation coefficient to be positive or negative? Why? f. Verify your answer for e) by computing the correlation coefficient.

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