Concept explainers
U.S. Birth and Death Rates. In 2015, the U.S. population was about 321 million. The overall birth rate was 12.5 births per 1000 people, and the overall death rate was 8.4 deaths per 1000 people.
a. Approximately how many births were there in the United States in 2015?
b. About how many deaths were there in the United States in that year?
c. Based on births and deaths alone (i.e., not counting immigration), about how much did the U.S. population increase during 2015?
d. Suppose that during 2015 the U.S. population actually increased by 3.0 million. Based on this fact and your results from part (c), estimate how many people immigrated to the United States. What proportion of the overall population growth was due to immigration?
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