Answer:
23.5
Explanation:
4, 4, 6, 10, 11, 13, 14, 15, 25, 29, 33, 33, 35, 43, 51, 58
Median: 20
Lower quartile: 10.5
Upper quartile: 34
Interquartile range: 34 - 10.5 = 23.5
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