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OpenStudy (anonymous):
which of the following are valid probability distributions for a discrete random variable a: 1/12,1/12,1/12,1/12,1/6,1/12,1/12, 1/12,1/12 b:1/5,1/5,1/5,1/5,1/5 c:-1/2,-1/3,-1/4,-1/5,137/60 d:1/6,1/5,1/4,1/3 e: 1/2,1/4,1/8,1/16, 1/32,1/64,1/128,1/128
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