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Which of the Following Is a Required Condition for a Discrete

Question 90

Multiple Choice

Which of the following is a required condition for a discrete probability function?

A) $\Sigma$ f(x) = 0 for all values of x
B) f(x) $\ge$ 1 for all values of x
C) f(x) < 0 for all values of x
D) $\Sigma$ f(x) = 1 for all values of x

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