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Siswa : 15
7,0 × 15 = 105
Jika nilai ulangan Tiffa dimasukkan.
Rata - rata : 7,125
Siswa : 16
7,125 × 16 = 114
= 114 - 105
= 9
Jadi, nilai ulangan Tiffa adalah 9
jawabannnya d. 9
*semoga membantu :)