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What is the interquartile range of the data set below?

Growth in feet of oak trees: 68,80,73,90,120,94,76,112,101,94,72

(1) 22                (2) 28             (3) 52          (4) 73

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68,80,73,90,120,94,76,112,101,94,72 --->
68, 72, 73, 76, 80, 90, 94, 94, 101, 112, 120

Median = 90
Lower Median = 73
Upper Median = 101

IQR = 101 - 73
IQR = 28

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