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Between what values of head circumferences fall

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Question: Big heads? The army reports that the distribution of head circumference among male soldiers is approximately Normal with mean 22.8 inches and standard deviation 1.1 inches. Use the 68-95-99.7 rule to answer these questions

(a) Between what values do the middle 95% of head circumferences fall?

(b) What percentage of soldiers have head circumferences greater than 23.9 inches?

Reference no: EM131638745

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