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Clarification of Probability Distribution

Determine whether each of the distributions given below represents a probability distribution. Justify your answer.

(A) x 1 2 3 4
p(x) 1/4 5/12 1/16 1/16

B) x 3 6 8
p(x) 0.2 2/5 0.4

c) x 20 35 40 50
p(x) 0.1 0.1 1/2 0.3

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