Question 7 / 8: 

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.

expected to have heights between 37 and 43 inches?

Assuming you see 100 patients during the week of October 4th, how many would be
Answer: 
37 and 43 are one standard deviation above and below the mean of 40. By the

68?-95?-99 rule described in the notes, we would expect about 68%, or 68 out of 100

patients to fall within one standard deviation unit of the mean.

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Epidemiology Biostatistics Descriptive Statistics

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Attribution:  Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA
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