The average life expectancy in the United States, L, has been rising steadily over the past few decades, as shown in the table below. Let t be the number of years since 1920, (so t=0 represents the year 1920). (a) Find the equation of the regression line. Average life expectancy, ?(t)= NOTE: this is a function of t (not x). (b) Estimate the average life expectancy in the United States in the year 1953 according to the linear model in part (a). Average life expectancy in 1953=

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