Card 8 / 11: The following scenario is applied to questions 6 and 7: You are a pediatrician who only sees patients who are 6 years old and have red hair. The distribution of the height of 6 year olds is approximately normal with a mean of 40 inches and a standard deviation of 3 inches. What percentile is Billy compared to all other 6 year olds?A red?-headed 6?-year?-old scamp named Billy measures 46 inches at his latest check?-up.
Answer:
Billy is 2 standard deviations above the mean. Therefore, according to the distribution of a theoretical normal distribution, he is at the 97.5th percentile. In other words, 97.5% of all 6?-year olds would have heights lower than Billy?fs.
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Epidemiology Biostatistics Descriptive Statistics
Author:
Dr.Janet ForresterProfessor
Tufts University School of Medicine
USA
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