假定平均数
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Of the retirees and pre-retirees who guessed the age to which an average person of his or her age and sex could expect to live, about 4 in 10 underestimated the age by five or more years and another 2 in 10 underestimated it by 2 to 4 years.
FORBES: Americans Clueless About Life Expectancy, Bungling Retirement Planning
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