Life expectancy refers to the average number of years a person is expected to live based on current mortality rates. It's often used as a measure of a nation's health.
Mortality Rate: A measure of the number of deaths in a particular population, scaled to the size of that population, per unit of time.
Infant Mortality Rate: The number of deaths per 1,000 live births of children under one year of age.
Demographics: Statistical data relating to the population and particular groups within it.
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