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Total frequency = 5+8+12+18+9+6+2 = 60. Median position = (60+1)/2 = 30.5. Cumulative frequencies: 5, 13, 25, 43, 52, 58, 60. The 30.5th value lies in the class where cumulative reaches ≥30.5, which is 16-20 (cumulative 43).
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