The sum of the probabilities of all possible outcomes of an experiment is:

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A One
B Two
C 0.75
D 0.5

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Answer: A. One

The probabilities of all possible outcomes add up to 1, because one of them is certain to happen. For a coin, P(head) + P(tail) = 1/2 + 1/2 = 1.

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The sum of the probabilities of all possible outcomes of an experiment is:

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