Problema Solution
In 1992, the life expectancy of males in a certain country was 61.7 years. In 1999, it was 64.9 years Let E express the life expectancy in year t and let t represent the number of years since 1992.
The linear function E(t) that fits the data is
E(t)=__t+__
Use the function to predict the life expectancy of males in 2003.
E(13)=?
Answer provided by our tutors
we have two points of the form (t,E)
One is (0,61.7) ; this is the intercept for the equation.
The other is (5,64.5)
slope = (64.5 - 61.7)/(5-0) = 2.8/5 = 0.56
The linear function E(t) that fits the data is
E(t)=_0.56t+61.7
Use the function to predict the life expectancy of males in 2005.
E(13) = 0.56*13 + 61.7 = 68.98 years