Well, the mean is always .2 no matter how many policies you write, so it's going to be--we're going to have a normal distribution centered on .2.

不论你签了多少份保单,均值永远是0.2,所以这就是一个关于x=0.2对称的,正态分布

耶鲁公开课 - 金融市场课程节选