Explain why each of the following is or is not a valid probability distribution for a discrete

Question:

Explain why each of the following is or is not a valid probability distribution for a discrete random variable x:

LO9

a. x 0 1 2 3 p(x) .2 .3 .3 .2

b. x -2 -1 0 p(x) .25 .50 .20

c. x 4 9 20 p(x) -.3 1.0 .3

d. x 2 3 5 6 p(x) .15 .20 .40 .35

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