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4+ 3x = 5x
4 = 2x
median = x
rata" = (2 + x - 1 + x + 4 + 2x - 1) / 5
= (4x + 4) / 5
rata" = median
(4x + 4) / 5 = x
4x + 4 = 5x
4x - 5x = - 4
- x = - 4
x = 4 jawaban C