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The mean lifetime represents
the average lifetime of an atomic nucleus in a radioactive sample.
The years that the individual
of a group (region, country, etc.) "can live" is the average life-time
of this population. If we add up the ages of all the people who have
died in a year (or in another period of time) and we divide it by the
total number of individuals we have found the arithmetic average of
their lives.
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