In 1950 the life expectancy of women was 72 years. In 1970 it was 75 years. E represents the life expectancy and T the number of years since 1950 (t=0 gives 1950 and t=10 gives 1960).

Question

a. fit a linear equation to predict life expectancy (0,72) AND (20,75)
The answer i got was E=3/20t=72

b. use the function to predict the life expectancy of women in 2003 and 2018.
I don't understand how i am supposed to set this and predict it.

Answer 1

I think you mistyped your equation.

E(t) = 72 + 3/20 t

See, when t=0, E = 72
When t=20, E = 72 + 3/20 (20) = 72 + 3 = 75.

So, now figure E(2003-1950) = E(53)
and E(2019-1950) = E(69)

Answer 2

whats the answer?