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SOLVED: The PEFR (peak expiratory flow rate) values of a group of 11-year-old girls follow a normal distribution with a mean of 300 liters/min and a standard deviation of 20 liters/min. Approximately what percentage of girls would have PEFR below 280 liters/min?A) 16%B) 68%C) 34%D) 95%
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