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= ([8x12,5] + [6x15])/14
= 190/14 = 95/7
misalkan bilangan ke-15 adalah x maka
rata-rata 15 bilangan = (190 + x) /15
13,4 = (190 + x) /15
13,4 x 15 = 190 + x
201 = 190 + x
x = 201 - 190 = 11