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.Year1910192019301940195019601970198019902000Median Age25.124.624.324.322.822.823.224.726.126.8What is the average rate of change over the ninety-year period described in the table?
Answer
A
0.19 years of age per year
B
-0.19 years of age per year
C
-0.019 years of age per year
D
0.019 years of age per year
Explanation
Use the change in median age divided by the change in time: (26.8 − 25.1) ÷ (2000 − 1910) = 1.7 ÷ 90 ≈ 0.019 years of age per year. The average rate of change is positive because the median age increased overall. The correct choice is 0.019 years of age per year.
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