In fact, you'll find the probability of this happening 3% is only about 3 percent, of it happening just by accident.

实际上你会发现,出现这种情况的概率是，所以说他们的实验结果完全是偶然的。

麻省理工公开课 - 计算机科学及编程导论课程节选

The idea really took root--the idea, the intuitive idea is that as you write a large number of policies, the fraction that will result in accidents becomes closer and closer to the probability of one accident.

这种观点建立在...,观点是,只要你签的保单足够多,事故占保单总数的比例就会越来越接近,事故发生的概率

耶鲁公开课 - 金融市场课程节选

I have the case where p = .2, so the probability of an accident is 20%.

假设这里的p等于0.2,也就是一次事故发生的概率为20%

耶鲁公开课 - 金融市场课程节选