Between which years did the world population double according to the graph?

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Multiple Choice

Between which years did the world population double according to the graph?

Explanation:
This question tests your ability to read a graph and identify when a quantity doubles. Doubling means the value in a later year is about twice the value in an earlier year, so you compare two points on the graph and see if the later point sits roughly at 2× the earlier value. Looking at the graph, from 1980 to 1990 the population rises from roughly 4 billion to about 8 billion. That’s a doubling. In the other intervals, the increases are smaller than a doubling (for example, 1970–1980 goes from about 3 to 4 billion, 1990–2000 from about 5 to 6–7 billion, and 2000–2010 from about 6–7 to 8–9 billion), none of which reach twice the starting value. So the decade in which the world population doubles according to the graph is 1980–1990.

This question tests your ability to read a graph and identify when a quantity doubles. Doubling means the value in a later year is about twice the value in an earlier year, so you compare two points on the graph and see if the later point sits roughly at 2× the earlier value.

Looking at the graph, from 1980 to 1990 the population rises from roughly 4 billion to about 8 billion. That’s a doubling. In the other intervals, the increases are smaller than a doubling (for example, 1970–1980 goes from about 3 to 4 billion, 1990–2000 from about 5 to 6–7 billion, and 2000–2010 from about 6–7 to 8–9 billion), none of which reach twice the starting value. So the decade in which the world population doubles according to the graph is 1980–1990.

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