The following table is an abbreviated life expectancy table for U.S. males:
Current Age Life Expectancy
0...................................................76.4
20.................................................77.3
40.................................................78.7
60.................................................81.7
80.................................................88.3
(a) Find the straight line that provides the least-squares fit to these data.
(b) Use the straight line of part (a) to estimate the life expectancy of a 30-year-old U.S. male.
(c) Use the straight line of part (a) to estimate the life expectancy of a 50-year-old U.S. male.
(d) Use the straight line of part (a) to estimate the life expectancy of a 90-year-old U.S. male.