The median age of the U.S. population in 1980 was 30.0 years. In 1991, the median age was 33.1 years.

For the median age to rise, is the actual number of children less in 1991 than it was in 1980? Why or why not? (Enter your percentages as a whole number.)

Not necessarily but that could be the case. In 1980, _________% of the population was 30 years old or less. In 1991, ____________% of the population was 33.1 years old or less. On July 1, 1980, the population was about 227.23 million. On July 1, 1991, the population was about 252.98 million. Since half of the population in 1991 was larger/smaller than half of the population in 1980 and the median age in 1991 was greater than the median age in 1980, there could have been fewer/more children in 1991.