1 Download a copy of the Supplied Cemetery Data sheet. 2 Determine the age at death for each individual using the equation: Age at death = Death year - Birth year 3 Record the age at death for each individual on the Supplied Cemetery Data sheet. 4 Count the number of individuals who died in each cohort (listed in Data Table 2) on the cemetery data sheet. 5 Record the number of deaths (D) for each cohort in Data Table 2. 6 Calculate the frequency of population in cohort (d) for each cohort using the equation:m