And so you have to figure out how to take that randomness out of the experiment.
因此你要明白怎么把随机数从试验中拿出来,有些时候你没法做一次有效的实验。
If you have an experiment and the outcome of the experiment is a number, then a random variable is the number that comes from the experiment.
如果你有一个试验,这个试验的结果是一个数,那么相对应的随机变量,指的就是这个试验结果所对应的那个数
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