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X= nilai terkecil
Q = Median = 17
Y= nilai terbesar
Jangkauan = Y - X = 15
Mean = 1/3 ( X + Q + Y) = 16
X + Q + Y = 48
Q = 17 --> X + Y = 31
X + Y = 31
Y - X = 15
kurangkan
2x = 16
x = 8