Verify that the following function is a probability mass function, and determine the requested probabilities. f(x) = (8/7)(1/2)¹.x = (1,2,3) Round your answers to four decimal places (e.g. 98.7654). Is the function a probability mass function? (a) P(X ≤ 1) = i (b) P(X > 1) = i (c) P(2 < X < 9) = i (d) P(X ≤ 2 or X > 2) = i

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