Question 610379
(A) 
x 1 2 3 4

P(x)3/5 12/25 3/25 0
No, because the sum of the P(x)'s is greater than one.
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(B) 
x 3 6 8

P(x)0.15 3/5 0.25
Yes beause sum of P(x)'s = 1 and each P(x) is between 0 and 1
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(C) 
x 20 35 40 50

P(x)0.45 0.25 1/4 0.05
Yes for same reason as for "B"
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Cheers,
Stan H.