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Q1 = 29,5 + 10
Letak Q2 (median) pada frekuensi = 1/2.70 = 35 => di kelas 50 - 60
Q2 = 49,5 + 10
Letak Q3 (kuartil atas) = 3/4.70 = 52,5 => dikelas 60 - 70
Q3 = 59,5 + 10