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For each of the following tables of probabilities for the random variable x, does it form...

For each of the following tables of probabilities for the random variable x, does it form a probability distribution? Why or why not?

X 5 10 15 20
P(x) 0.10 -0.30 0.50 0.70
X 0 1 2 3 4
p(x) 0.02 0.07 0.22 0.27 0.42
Math   Statistics-And-Probability   
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