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

(A)

x

1

2

3

4

P(x)

1/3

7/12

1/4

0

(B)

x

3

6

8

P(x)

0.4

1/4

0.3

(C)

x

20

35

40

50

P(x)

0.5

-0.2

0.3

0.4

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