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Social & Preventive Medicine
The PEFR of a group of 11 year old girls follow a normal distribution with mean 300 L/min and stardard detion 20 L/min-
About 95 % of the girls have PEFR between 260 and 340 L/min
The girls have healthy lungs
About 5% of girls have PEFR below 260 L/min
All the PEFR must be less than 340 L/min
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