Sum of all probablities = ________
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The sum of the probabilities of all possibilities must equal 1 . Some outcome must occur on every trial, and the sum of all probabilities is 100%, or in this case, 1 . This can be written as P(S)=1 P ( S ) = 1 , where S represents the entire sample space.
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Step-by-step explanation:
because sum of an probabilities means that is 100% going to happen. and if something will definately happen we say the probability is 1
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