3 20 In a study of 1 329 American men reported in American Statistician 1974 28 115 122 the men were classified by serum cholesterol and blood pressure The group of 408 men who had blood pressure readings less than 127 mm Hg were then classified according to their serum cholesterol level Serum Cholesterol mg 100cc 0 0 199 9 200 0 219 9 220 0 259 9 greater than 259 Frequency 119 88 127 74 a Estimate the mode median and mean for the serum cholesterol readings if possible b Which of the three summary statistics is most informative concerning a typical