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Mathematics, 21.04.2020 17:31 xxcynthistxx

One reason for the increase in human life span over the years has been the advances in medical technology. The average life span for American women from 1907 through 2007 is given by

W(t) = 49.9 + 17.1 ln t (1 ? t ? 6)

where W(t) is measured in years and t is measured in 20-year intervals, with

t = 1

corresponding to 1907

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