The following table gives the 2015 life expectancy at birth for several countries.

(a) Use the method of least squares to obtain the straight line that best fits these data.
(b) In Greece, the life expectancy of men is 77.8 years. Use the least-squares line from (a) to estimate the life expectancy for women.
(c) In France, the life expectancy for women is 85.0 years. Use the least-squares line from (a) to estimate the life expectancy for men.

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Country Male Female 77.3 United States 82.0 78.3 Germany 83.0 79.7 Australia 84.7 88.3 Japan 81.4