2. The following list represents the percentage of oxygen content (in g/L) of a given substance after various samples were taken: (the values have been ordered for convenience) 13 39 3 5 7 9 10 11 15 16 18 20 21 22 23 27 28 29 30 34 36 37 38 40 41 42 43 45 46 47 48 49 50 52 54 55 a) Find the Inter quartile range

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