The following figure shows survival curves (percent surviving as a function of age) for people in the United States in 1900 and 2000. Let ƒ(x, y) give the proportion surviving at age x in year y. Use the graph to estimate the following. Interpret each answer in words.

(a) ƒ(60, 1900) 

(b) ƒ(70, 2000)
(c) ƒ_x(60, 1900) 

(d) ƒ_x(70, 2000)

Transcribed Image Text:

Percent surviving 100 80 60 40+ 20 0 0 1900 10 +++ 20 2000 30 40 50 60 Age (in years) 70 80 90 100