The histogram in Figure 3.12 depicts cotinine levels (in milligrams per milliliter) of a sample of subjects who smoke cigarettes. Cotinine is a metabolite of nicotine, which means that cotinine is produced by the body when nicotine is absorbed. The data are from the Third National Health and Nutrition Examination Survey.

a. How many subjects are represented in the histogram?

b. How many subjects have cotinine levels below 400?

c. How many subjects have cotinine levels above 150?

d. What is the highest possible cotinine level of a subject represented in this histogram?

Figure 3.12

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Transcribed Image Text:

15.0 1 10.00 5.00 0.00 200 400 600 Sample Vake