16Hit1600
Information and IdeasMediumDescribing a rising series

Information and Ideas practice question

Share of a country's electricity generated from wind: 2010: 4% 2015: 9% 2020: 17% 2025: 24%

Which choice most accurately completes the statement? 'Between 2010 and 2025, the share of electricity from wind ____'

  1. A. rose in every five-year period shown, reaching six times its 2010 level by 2025.Correct
  2. B. doubled in every five-year period shown.
  3. C. rose fastest between 2010 and 2015.
  4. D. fell between 2020 and 2025.

Answer: A. rose in every five-year period shown, reaching six times its 2010 level by 2025.

4 → 9 → 17 → 24 rises every period, and 24 is six times 4.

Why the other answers are wrong

B. doubled in every five-year period shown.
9 to 17 and 17 to 24 are each less than doubling.
C. rose fastest between 2010 and 2015.
The largest rise is 2015 to 2020 (8 points); 2010 to 2015 rose 5 points.
D. fell between 2020 and 2025.
17 to 24 is a rise, not a fall.

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