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No, it's not "closer to median life span." Expected value is a mean. In the case of life expectancy at age X, it is the mean, conditional on having already su
by tanzam75 14y ago
No, it's not "closer to median life span."
Expected value is a mean.
In the case of life expectancy at age X, it is the mean, conditional on having already survived to age X. (In other words, life expectancy at age 20 excludes everyone who died between birth and age 20.)