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- Dictionarylife ex·pec·tan·cy/ˈˌlaɪf ɪkˈspɛktənsi/
noun
- 1. the average period that a person may expect to live: "the British male now has a life expectancy of 77.6 years"
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noun
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Statistical measure of how long a person or organism may live, based on factors of their life
Human life expectancy is a statistical measure of the estimate of the average remaining years of life at a given age. The most commonly used measure is life expectancy at birth (LEB, or in demographic notation e 0, where e x denotes the average life remaining at age x). This can be defined in two ways. Wikipedia