16Hit1600
Information and IdeasMediumIdentifying the largest drop in a falling series

Information and Ideas practice question

Share of a country's electricity generated from coal: 2005: 45% 2010: 40% 2015: 30% 2020: 15% 2025: 8%

Which statement is best supported by the data?

  1. A. Coal's share fell in every period shown, and the largest single drop came between 2015 and 2020.Correct
  2. B. Coal's share rose before it began to fall.
  3. C. The largest single drop came between 2005 and 2010.
  4. D. Coal's share fell by the same amount in every period.

Answer: A. Coal's share fell in every period shown, and the largest single drop came between 2015 and 2020.

Drops: 5, 10, 15, 7 points. All are falls, and 2015–2020 (15 points) is the largest.

Why the other answers are wrong

B. Coal's share rose before it began to fall.
The share never rises.
C. The largest single drop came between 2005 and 2010.
2005–2010 is the SMALLEST drop, 5 points.
D. Coal's share fell by the same amount in every period.
The drops range from 5 to 15 points.

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