Practice Quiz

LSAT

Category - Logical Reasoning

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A government study indicated that although a BMI (body mass index) of 25 or under is considered healthy, most people have a BMI far above 25. It was therefore proposed that since the average BMI is 29, the criteria for what constitutes a healthy BMI should be raised to 29.

Which of the following is a flaw in the government’s reasoning?
  1. An average does not necessarily depict what is desirable.
  2. It presumes that a healthy BMI is achievable by everyone.
  3. It presumes, without providing justification, that a BMI average of 29 is consistent across all populations.
  4. It fails to consider the possibility that BMI is an inappropriate metric to measure health.
  5. It fails to consider the possibility that BMI is not the best metric to measure health.
Explanation
Answer: A - The flaw is the government’s reasoning is that an average does not necessarily depict what is desirable. The new BMI is not automatically healthy just because it’s the average, and the passage gives no reason to show why the standards should have changed.
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