what do you mean by expectation
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Answer:
A strong belief that something will happen
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Answer:
the number of years that a person
Life expectancy has doubled in all world regions. What does this mean exactly?
Despite its importance and prominence in research and policy, it is surprisingly difficult to find a simple yet detailed description of what “life expectancy” actually means. In this section, we try to fill this gap.
The term “life expectancy” refers to the number of years a person can expect to live. By definition, life expectancy is based on an estimate of the average age that members of a particular population group will be when they die.
In practice, however, things are often more complicated:
One important distinction and clarification is the difference between cohort and period life expectancy.
The cohort life expectancy is the average life length of a particular cohort – a group of individuals born in a given year. When we can track a group of people born in a particular year, many decades ago, and observe the exact date in which each one of them died then we can calculate this cohort’s life expectancy by simply calculating the average of the ages of all members when they died.
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