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A random variable X is defined as the distance a dart lands from the center of the target. The probability density of the variable is p(x). Which statement about X or its probability distribution is generally true? X is a discrete random variable with an infinite number of values. The variance of X is 0. The probability P(x1 < X < x2) is given by the area under the curve between x1 and x2. The mean value of X is 0.

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