Which statements about a probability distribution are always true? The probability of an outcome is never 0. The expected value

Question

Which statements about a probability distribution are always true?
The probability of an outcome is never 0.
The expected value of a probability distribution is the mean of the distribution.
The sum of the probabilities in a probability distribution is equal to 1.
Values for for a discrete random variable X in a probability distribution are always positive.
A probability distribution must have more than one outcome.

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