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n = frekuensi = 4 + 8 + 7 + 5 + 9 + 7 = 40
n/2 = 40/2 = 20
kelas dgn frekunsi ke 20 => 50 - 54 , maka:
tb = 50 - 0,5 = 49,5
fk = 4 + 8 + 7 = 19
fi = 5
c = (39 - 35) + 1 = 5
Jadi, nilai median dari data di atas adalah 50.5 kg.