The National Health and Nutrition Examination Survey (NHANES) measured the serum HDL cholesterol levels in a large number of women. Following is a sample of 40 HDL levels (in milligrams per deciliter) that are based on the results of that survey. They have been sorted into numerical order.

a. Find the first and third quartiles of these data.

b. Find the median of these data.

c. Find the upper and lower outlier boundaries.

d. Are there any outliers? If so, list them.

e. Construct a boxplot for these data.

f. Describe the shape of this distribution.
g. What is the 20th percentile?
h. What is the 67th percentile?
i. One woman had a cholesterol level of 58.

What percentile is this?

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