Question: D Question 3 5 pts Let Y be a discrete random variable with probability mass function p(y) = Pr (Y = y) = a -

D Question 3 5 pts Let Y be a discrete random variable with probability mass function p(y) = Pr (Y = y) = a - . fory = 1, 2, 3, where a and b are constants. If it is known that E[ Y] = 6, what must be the values of a and b? Note: in the answer box, type the sum of a plus b. For example, if your answers are a = 123 and b =-122, then the number you will type in the box is 1

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