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7,2 = 109 + 7x / 15 + x
108 + 7,2x = 109 + 7x
108-109 = 7x-7,2x
-1=-0,2x
x=5
Nilai : 5,6,7,8,9,10 frekuensi : 2,5,x,4,3,1
jika mean dari data di atas adalah 7,2 maka nilai x adalah...