The mean age at death of people in a given population is known as
Blank
______.

Question

The mean age at death of people in a given population is known as 
Blank
______.

BlackTom AI · Accepted Answer

Life expectancy denotes the average age at death for members of a population, so it directly matches the phrase "mean age at death."

1) Relevant concepts:
- Life expectancy: the statistical average number of years a person or cohort is expected to live, commonly calculated from life tables using age-specific mortality rates.
- Life span: the maximum potential length of life for an individual or species (e.g., human maximum observed lifespan), not an average.
- Mortality rate: a measure of deaths in a population over a specified time, usually expressed per 1,000 or as a percentage; it is a rate, not an average age at death.
- Mean mortality: not a standard demographic term; could be misconstrued, but it would not correctly denote average age at death.

2) Step-by-step reasoning:
- The prompt asks for the term that means the "mean age at death" — that is, the average number of years lived by individuals who die in a population or an expected average life length for a birth cohort.
- Life expectancy is defined and widely used for exactly this purpose: it is computed as the arithmetic mean (expected value) of ages at death derived from a life table.
- Life span refers to the upper biological limit and does not provide an average; it answers "how long can someone live?" rather than "on average how long do people live?"
- Mortality rate quantifies frequency of deaths, e.g., deaths per 1,000 population per year; it does not measure age at death.
- "Mean mortality" is not a standard term and would be ambiguous if used; it does not accurately describe average age at death.

3) Conclusion:
Because life expectancy specifically means the average (mean) age at death for a population and the other options denote different concepts, the correct choice is life expectancy. This matches the provided answer: life expectancy.

The mean age at death of people in a given population is known as Blank ______.单项选择题

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