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普哇松分布当某种事件发生的可能性很小,也就是,它发生的概率很低(P(?)1),而抽样数n又相当大时,就属于普哇松分布。譬如,研究轧制钢板表面上的某种疵点缺陷,我们可以把每一疵点看作是一个几何学上的点子。设想把钢权表面分为大小相等的n个小单位面积。因为n可以设想为很大的数字,也就是,单位面积是很小的面积,所以可假定每一单位面积至多只能含有一个疵点。这样一来,对照抽螺钉的例子,就可以把钢板表面上的n
Puhuasong distribution is very unlikely when an event occurs, that is, it has a low probability of occurrence (P(?)1). When the sampling number n is quite large, it belongs to Puhuasong distribution. For example, to study a defect in the surface of a rolled steel plate, we can regard each point as a geometrical idea. It is envisaged to divide the surface of the steel weight into n small unit areas of equal size. Since n can be thought of as a large number, that is, a unit area is a very small area, it can be assumed that each unit area can contain at most one flaw. In this way, on the surface of the steel plate, you can use the example of an extraction screw.