Which of the following is an absolute requirement for a valid probability distribution?
Which of the following is an absolute requirement for a valid probability distribution?
- A. Mean must be zero
- B. All probabilities must be equal
- C. Sum of probabilities must equal 1 and all P(x) ≥ 0
- D. Variance must equal the mean
Answer: C) Sum of probabilities must equal 1 and all P(x) ≥ 0
Explanation: By definition, a valid probability distribution must have non-negative probabilities that sum exactly to 1.
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