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General Medicine General d04257ef

The PEFR of a group of 11 year old girls follow a normal distrubution with mean 300 1/min and standard deviation 20 1/min -

A
About 95% of the girls have PEFR between 260 and 340 1/min.
B
The girls have healthy lungs
C
About 5% of girls have PEFR below 260 1/min.
D
All the PEFR must be less than 340 1/min.

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