All of the following statements are true for all discrete random variables except for which one? A. The possible outcomes must all be numerical. B. The possible outcomes must be mutually exclusive. C. The mean (expected value) always equals the sum of the products obtained by multiplying each value by its corresponding probability. D. The standard deviation of a random variable can never be negative. E. Approximately 95% of the outcomes will be within two standard deviations of the mean.
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