Question 1105043
mean is (7/60) * 719 = 83.8833 approximately 84 have genetic condition B 
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proportion is 7/60 is approximately 0.12
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we use the binomial distribution's standard deviation
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standard deviation is sqrt(719 * 0.12 * (1-0.12)) = 8.7136 approximately 8.71
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2 * standard deviation is 17.42 
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min/max usual value is [67, 101 ]
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min/max usual value rounded (66.6, 101.4)
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