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Valid probability distribution

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A) Which of the following is a valid probability assignment for an event whose sample space is {A, B, C, D, F}?
b) Explain the reason why each of the other two is not a valid probability assignment.

Outcome Probability
A 0.15 0.25 0.25
B 0.6 0.5 0.6
C 0.2 0.21 0.2
D 0.05 0.03 -0.2
F 0 0.07 0.14

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This posting has a problem on choosing a valid probability distribution for given sample space.

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5.
a) Which of the following is a valid probability assignment for an event whose sample space is {A, B, C, D, F}?
Probability assignment I is the valid one for ...

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