The variance of a random variable measures how far from the expected value its values typically are.
随机变量的方差衡量随机变量值与期望值偏离的程度。
Demonstrate understanding of the concept and properties of a discrete random variable, including calculation and interpretation of the mean and variance.
示范不连续任意的变数观念和财产的理解，包括计算和解释那低劣的和不一致。
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