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An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and let Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table: If the score recorded in the grade book is the total number of points earned on the two parts, what is the expected recorded score, E(X+Y)? Solution required = 0*0.02 + 5*(0.06+0.04) + 10*(0.01 + 0.02 + 0.15) + 15*(0.2+0.15 + 0.10) + 20*(0.10+0.14) + 25*(0.01) = 11.4.

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- An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and let Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table: If the score recorded in the grade book is the total number of points earned on the two parts, what is the expected recorded score, E(X+Y)? Solution required = 0*0.02 + 5*(0.06+0.04) + 10*(0.01 + 0.02 + 0.15) + 15*(0.2+0.15 + 0.10) + 20*(0.10+0.14) + 25*(0.01) = 11.4

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