first moment

一次矩，一阶矩

同：	[n.] arithmetic mean, expectation, expected value

On the first Tuesday morning the choice for a moment seemed to lie between an air strike or acquiescence
在第一个星期二的上午，一时看来，要在空袭或默认之间作出选择。收藏
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收藏
The bum first led me to a table and asked me to sit down and wait for a moment while he looked for something special amongst the shelves.
老流浪汉先把我带到一张桌子前，让我坐下来稍等片刻，而他则到那些林立的书架中去寻找那个特别重要的东西去了。收藏
The first moment is clockwise and the second is counterclockwise
第一个力矩为顺时针方向，第二个力矩为反时针方向。收藏
The lucky moment of the first born
初度良辰收藏

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the sum of the values of a random variable divided by the number of values
[同] expectation, expected value, first moment, arithmetic mean

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