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\fQuestion 12 Let the joint probability mas function of two discrete random variables X and Y be given as f ( x , y ) = = 15 ( x + y ) for x = 0, 1, 2 and y = 1.2. Find fx| y =1(x). Oa. 1 -x+3 Ob. (2x - 1) O c. 3x +2 O d. 1 6 ( x + 1 )Question 14 A die is rolled 12 times. What is the expected value of the sum of the outcomes? O a. 42 b. 24 O c. 51 O d. 36