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1. Ask your parents and other people present at your birth. Your parents might remember when you were born, or direct you to other family members or friends who were there when you were born. They may also have a copy of your birth certificate.
The answer depends on the number already in that population. To determine per capita birth or death rates, you simply divide the absolute number of births (B) or deaths (D) by the number in the population (N) at the midpoint of the time interval (usually year).By convention, for human demographics, we use the total number (N) of people, regardless of age or sex.he answer depends on the number already in that population. To determine per capita birth or death rates, you simply divide the absolute number of births (B) or deaths (D) by the number in the population (N) at the midpoint of the time interval (usually year).