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) The reading of bin from 195 -200 on y intercept is the proportion of patients that have cholestrol from 195 to 199 =0.05

So 5% is the answer

b)Similarly to part a for cholestrol level 215 or high

add the y intercepts of bin 215-220 and 220-225=0.15+0.25=0.4

So the answer is 40%

c) The rative frequency of people having cholestrol from 205 to 209 =0.15

If the total patients is 20 then number of people having cholestrol from 205 to 209 =0.15*20=3

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