Explain why each of the following distributions is or is not a probability distribution: (a) (b) x

Explain why each of the following distributions is or is not a probability distribution:

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(a) (b) x P(X = x) x P(X = x) 01234 0.15 0 0.15 0.25 1 0.20 0.10 2 0.30 0.25 3 0.10 0.30 (c) = 0 P(X = x) 0.15 (d) x P(X = x) 0.15 1 -0.20 0 0.30 234 0.30 1 0.20 0.20 2 0.15 0.15 34 0.10 4 0.10