The average number of years a person is expected to live at the time of birth is called

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Life expectancy

Health ratio

Mortality rate

Infant life expectancy

answer is A.

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Detailed Solution

Life expectancy is the average number of years a person is expected to live at the time of birth.
It is an illustrative metric. It is predicted that people born in the year in question will die at the age-specific mortality rates of their lives. The estimate, in essence, extrapolates the age-specific mortality (death) rates across the lifespan of people born (or alive) during that time. The measure varies significantly depending on sex, age, race, and locality. Therefore, life expectancy is frequently reported for particular categories rather than for the entire population.

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