A pediatrician tested the cholesterol levels of several young patients. The foll

Question

A pediatrician tested the cholesterol levels of several young patients. The following relative-frequency histogram shows the readings for some patients who had high cholesterol levels. Use the graph to answer the following questions. Note that cholesterol levels are always expressed as whole numbers. What percentage of patients have cholesterol levels between 195 and 199 inclusive? 5% What percentage of patients have levels of 215 or higher? 40% If the number of patients is 20, how many have levels between 205 and 209, inclusive? patients

Explanation / Answer

a. Relative frequency for level between 195 and 199 is 0.05, so 5%

b.Relative frequency for levels 215 or higher is 1.5+2.5=4%

c. Now for 20 patients relative   frequency between 205 and 209 is 0.15, i.e. 15%

So 20*0.15=3 will have the levels between 205 and 209 inclusive.

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