Has the marrying age of a man changed over the years? the united states bureau of the census takes a formal count of everyone in the u. s. every 10 years and has provided the following data that gives the median age of an american man at the time of his first marriage.

year / median age
1910 / 25.1

1920 / 24.6

1930 / 24.3

1940 / 24.3

1950 / 22.8

1960 / 22.8

1970 / 23.2

1980 / 24.7

1990 / 26.1

2000 / 26.8

determine the average rate of change in median age per year from 1950 to 1990.
a.) 0.0825 years of age per year
b.) 0.825 years of age per year
c.) 1.21 years of age per year
d.) -1.21 years of age per year