Verify that the following function is a probability mass function, and determine the requested probabilities. f(x) = (125/31) (1/5)*, x = {1,2,3} Round your answers to four decimal places (e.g. 0.9876). Is the function a probability mass function? Yes (a) P(X 1) = 0.8064 (b) P(X1)= i 0.1612 (c) P(2X < 9) = 0.0322 (d) P(X 1 or X > 1) = i 0.9996