The scatterplot in How It Works 3.1 depicts the relation between fertility and life expectancy. Each dot represents a country (or, as in the case of Hong Kong, a special administrative region). 

a. Approximately, what is the highest life expectancy in years? Approximately, what fertility rate (children per woman) is associated with the highest life expectancy? 

b. Does this seem to be a linear relation? Explain why or why not, an d explain the relation in plain English.