In the given question, Mean (μ) = 30 mm and SD (σ) = 1.0 mm Thus, 95% values are contained in the range of Mean ± 2 SD (µ ± 2σ) or 30 ± 2 (1) So, 95% values are contained in the range 30 – 2 mm and 30 + 2 mm OR between 28 and 30 mm.
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