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12
70 = 785 + x
12
840 = 785 + x
x = 55
jadi, 50, 55, 55, 60, 65, 65, 75, 75, 80, 80, 90, 90
Me = Xn + Xn + 1
2
Me = X12/2 + X12/2+1
2
Me = X6 + X7
2
Me = (65 + 75) / 2
= 140 / 2 = 70
maaf kalo salah