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

 

 


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