1. First you must put the data in order
42, 59, 75, 88, 95, 108, 121, 143, 150
Range = (150 - 42)/2 = 108/2 = 54
Median = middle number = 95
Upper Quartile = (143 + 121)/2 = 132
Lower Quartile = (75 + 59)/2 = 67
InterQuartile Range = 132 - 67 = 65
2. Range = 14.5
Median = 27.95
Upper Quartile = 33.25
Lower Quartile = 22.85
Interquartile Range = 10.4