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expected value 汉语翻译【计】 期望值, 期待值 【化】 期望值; 期待值; 统计平均值 【经】 预期值 英语解释：名词 expected value:- the sum of the values of a random variable divided by the number of values
同义词：arithmetic mean, first moment, expectation
例句：- The expected value of a positive integral power of a random variable. The first moment is the mean of the distribution.
矩，动差任意变量的正整数功效的期望值。第一个矩是分配的平均数
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