Question: 4. The distribution function of a random variable X is given by F (x) = 0 if x < 2 1/2 if

4. The distribution function of a random variable X is given by F (x) =    0 if x < −2 1/2 if −2 ≤ x < 2 3/5 if 2 ≤ x < 4 8/9 if 4 ≤ x < 6 1 if x ≥ 6. Determine the probability mass function of X and sketch its graph.

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