Find the range and interquartile range and median of the following data set. 11, 19, 5, 24, 3, 23, 16, 15, 16, 12, 6, 22, 11, 7 Solution Range = 24 - 3 = 21 First quartile = 7 Third quartile = 19 Interquartile Range = 19 - 7 = 11 Median = (12 + 15) / 2 = 27/2 = 13.5 .