Life span of human beings ● Average life 80 ● 3 years as a baby 3 years in kindergarten 9 years in primary school and high school 4 years in university 5 years to pursue Ph.D degree Retire after 60 Working time=80-47=33 yrs ● Sleeping(8),eating(2),shopping(4/7days),dating(3yrs,1) going to hospital(3days every year),traveling(2), breeding(10yrs,2) Vorking time:=33X365X(24-8-2-2)-3X365X1-3X33X8 33X365X4/7-10X365X2=128470hrs=14.66yrsLife span of human beings • Average life 80 • 3 years as a baby • 3 years in kindergarten • 9 years in primary school and high school • 4 years in university • 5 years to pursue Ph. D degree • Retire after 60 • Working time=80-47=33 yrs • Sleeping(8), eating(2), shopping(4/7days), dating(3yrs, 1), going to hospital(3days every year), traveling(2), breeding(10yrs, 2) • Working time=33X365X(24-8-2-2)-3X365X1-3X33X8- 33X365X4/7-10X365X2=128470 hrs=14.66 yrs