The figure below is a histogram showing the distribution of serum cholesterol level for a sample of men. Use the histogram to answer the following questions:
a. Is the percentage of men with cholesterol levels above 240 mg/dL closest to 30%, 50%, or 70%?
b. In which interval are there more men: 240-260 mg/dL or 280-340 mg/dL?
(a) The proportion is the sum of the relative frequencies (heights) of the rectangles above 240. This sum is approximately 0.14 + 0.10 + 0.05 + 0.01 + 0.02. This is closest to 30%.
(b) The height of the rectangle over the interval 240–260 is greater than the sum of the heights of the rectangles over the interval 280–340. Therefore there are more men in the interval 240–260 mg/dL.
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