MATH 431 Midterm: 2014 Math 431 - Anderson - Sping Exam 3
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This may earn you partial credit: no calculators or other electronic devices, please. Turn o your phone: you do not have to carry out complicated numerical computations, but you should simplify your answer if it is possible with reasonable e ort, please present your solutions in a clear manner. A numerical answer without expla- nation cannot get credit. The joint probability mass function of the random variables (x, y ) is given by the following table: This problem has four parts, with two on this page and two on the next. (a) (5 pts. ) Find the conditional probability mass function of x given y = y for each y = 0, 1, 2. (d) (5 pts. ) Suppose that a professor chooses a random student in a class of 40 students (there are 23 girls and 17 boys in the class) to perform a calculation on the board.
