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x = Jumlah/Frekuensi
x. Frekuensi = Jumlah
12.10 = 7+9+12+8+10+15+18+14+16+x
120 = 109+x
x = 120-109 = 11
12 = 7 + 9 + 12 + 8 + 10 + 15 + 18 + 14 + 16 + x
10
12 x 10 = 7 + 9 + 12 + 8 + 10 + 15 + 18 + 14 + 16 + x
120 = 7 + 9 + 12 + 8 + 10 + 15 + 18 + 14 + 16 + x
120 = 109 + x
x = 120 - 109
x = 11 =a