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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-

A

About 95 % of the girls have PEFR between 260 and 340 L\/min

B

The girls have healthy lungs

C

About 5% of girls have PEFR below 260 L\/min

D

All the PEFR must be less than 340 L\/min

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