Question

U.S. Birth Rate, 1950-2000





Year

Birth Rate


(per 1000 population)


1950

24.1


1960

23.7


1970

18.4


1980

15.9


1990

15.7


2000

14.7


Source: World Almanac 2003






Is the relation (year, birth rate) a function? Explain.



a.

No, there is a year with two birth rates paired with it.


b.

Yes, each year is paired with only one value for the birth rate.


c.

No, two years have a birth rate of over 20.


d.

No, there are no negative birth rate values.