Problem-Solving and Data AnalysisHardRecognising a decreasing but flattening trend
Problem-Solving and Data Analysis practice question
Year 1: 50
Year 2: 41
Year 3: 33
Year 4: 26
Year 5: 20
The table shows the number of a certain rare bird counted in a reserve in each of five years. Which of the following best describes how the count changed over these years?
- A. Decreasing at a slowing rateCorrect
- B. Decreasing at a constant rate
- C. Decreasing at an increasing rate
- D. Increasing at a slowing rate
Answer: A. Decreasing at a slowing rate
Year-to-year changes: −9, −8, −7, −6. The count falls each year, but by less each time.
Why the other answers are wrong
- B. Decreasing at a constant rate
- A constant rate would give equal drops, but they shrink from 9 to 6.
- C. Decreasing at an increasing rate
- The drops are shrinking, not growing.
- D. Increasing at a slowing rate
- The count is falling every year.
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