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

來源: 於 2012-11-17 11:55:41 [舊帖] [給我悄悄話] 本文已被閱讀：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.