In a normally distributed dataset of haemoglobin values, the mean is 12 g/dL and standard deviation is 2 g/dL. Approximately what percentage of values fall between 10 and 14 g/dL?
- A 68% ✓
- B 95%
- C 99.7%
- D 50%
Correct answer: A. 68%
Explanation
The range 10–14 g/dL is exactly Mean ± 1 SD (12 ± 2). In a normal distribution, 68% of values fall within one standard deviation of the mean. Mean ± 2 SD (8–16 g/dL) would contain approximately 95% of values, and Mean ± 3 SD would contain 99.7%.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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