According to the study on sports and longevity, about how many years on average did the researchers find added to a tennis player's life?

Question

BlackTom AI · Accepted Answer

The study reported that tennis players lived about 9.7 years longer on average.

1) Relevant knowledge points and concepts
- Longitudinal and epidemiological studies often compare mean life expectancy between groups (e.g., athletes vs. general population).
- The key quantity here is the average (mean) difference in years of life gained.
- Multiple-choice options present candidate mean increases; the correct value must match the study’s reported mean.

2) Step-by-step reasoning process
- Read the question: it asks for the average added years to a tennis player’s life reported by the study.
- Review the answer choices: 6.7, 3.5, 15.2, 9.7.
- Identify which value equals the study’s reported mean increase.

3) Intermediate steps / verification
- Compare each choice to the reported study result:
  - Option A: 6.7 years — lower than the reported figure.
  - Option B: 3.5 years — substantially lower than reported.
  - Option C: 15.2 years — substantially higher than reported.
  - Option D: 9.7 years — matches the study’s reported mean increase.
- No further arithmetic is required because the question asks for a reported statistic rather than a computed value from raw data.

4) Why the correct answer is correct
- The study’s headline finding for tennis specifically was an average lifespan benefit of about 9.7 years. That numeric value is the exact statistic cited by the researchers for tennis players’ added longevity, so the correct multiple-choice selection is 9.7 years.

5) Why other options are incorrect
- 6.7 years and 3.5 years are smaller than the reported benefit and thus do not match the study’s tennis-specific result.
- 15.2 years is larger than the reported figure and overstates the study’s finding for tennis players.

6) Conclusion
- The correct answer is 9.7 years, which matches the provided answer and is confirmed by the study’s reported average increase in lifespan for tennis players.

According to the study on sports and longevity, about how many years on average did the researchers find added to a tennis player's life?单项选择题

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