Good math,but ....,the life span is from birthday to last day fo

来源: 于 2012-11-17 11:55:41 [旧帖] [给我悄悄话] 本文已被阅读：次

So,...total ratio= 77.11/(72.82*1.13)=0.937.not 1. from the table,we know male babies are more and easier exist till 15,later men are easier die.