But paleontologists have used some clever statistics to adjust for those inconsistencies, and the latest diversity curve makes it look like there have been eight major mass extinctions rather than five.

但古生物学家使用一些聪明统计法来校正误差，最新物种曲看来有八次大灭绝，而非五次。

In statistics, pi is used in the equation to calculate the area under a normal distribution curve; which comes in handy for figuring out distributions of standardized test scores, financial models, or margins of error in scientific results.

在统计学中，π 可代入等式中用来计算正态分布曲面积；在计算标准化考试分数、财务模型或科学结果误差范围时都会用到。