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: 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1980, 1990, 2000
Median Age: 25.1, 24.6, 24.3, 24.3, 22.8, 22.8, 23.2, 24.7, 26.1, 26.8

Determine a ten-year period when the AVERAGE RATE OF CHANGE IS NEGATIVE
a.1910 - 1920
b.1920 - 1930
c.1940 - 1950
d. All of the above