You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is The PEFR of a group of 11 year old girls follow a normal distribution with mean 300 l/min and standard detion 20 l/min : and explain in detail?
S.D AREA BETWEEN S.D One S.D 68.3% Two S.D 95.4% Three S.D 99.7% So, 95%, about girls have PEFR between two S.D Given in question mean = 300L/min S.D = 20L/min A. Girls between one S.D= 68.3% = 300+/- 1 x20 = 320 to 280 So, 68.3% girls have PEFR between 320 and 280L/min B.Girls between two S.D = 95.5% = 300+/- 2 x 20 = 340 to 260 So, 95% girls have PEFR between 260 and 340L/min C. Girls between three S.D = 99.7% = 300 +/- 3 X 20 = 300+/- 60 = 360 to 240 Ref: Park's Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 402