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?
- A. Coal's share fell in every period shown, and the largest single drop came between 2015 and 2020.Correct
- B. Coal's share rose before it began to fall.
- C. The largest single drop came between 2005 and 2010.
- 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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