The Normal Distribution

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Bell curve, symmetric, mean=median=mode. 68–95–99.7 rule (±1/2/3 SD). Reference ranges = mean ± 1.96 SD (95%). Worked example: if mean Hb 140 SD 10, 95% lie 120–160. Interactive NormalDistribution lets user move SD bands. Exam tip: 1.96 ≈ 2 for 95%.

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