实践出真知，每天下午去扫一遍，more than once will introduce bias, do this

实践出真知，每天下午去扫一遍，more than once will introduce bias, do this

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送交者: chouqilozi 于 2009-02-11, 14:15:55:

回答: 很不错的随机过程的例子。怎么知道她平均要扫多长时间才能发现一个车位？由 Amsel 于 2009-02-11, 13:57:48:

for a year; or concerned about seasonal fluctuation, do this for N years.