1. The problem statement, all variables and given/known data 2. Relevant equations integral from -inf to inf of fx(x)dx = 1, fx(x)=PMF 3. The attempt at a solution I get values for probability function PMF of: 0.3, x=0 0.3, x=2 A-0.6, x=3 I guess I try to find area under curve of PMF which will be equal to 1. (0.3)(2) + (1/2)(1)(A-0.6-(0.3))=1 -> A=1.7 Am I doing it right?