1.17 The back-to-back histogram (often called a population pyramid) shown in Figure below displays the age distributions of the U.S. population in 1890 and 2005 (projected by U.S. Census Bureau, Statistical Abstract of the United States, 2001).

a Is the age distribution of the U.S. population changing? If so, what might that say about our quality of life in future years?
b Approximately what percentage of the population was under age 30 in 1890? In 2005?
c How would you describe the major changes in the age distribution over this century?

Transcribed Image Text:

Age 70+ 60-69 50-59 40-49 6.2 8.0 12.7 15.6 1890 2005 30-39 20-29 13.4 13.4 10-19 14.5 0-9 13.3 30 20 10 0 10 20