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83 = 800 + 2x / 10+2
83 = 800 + 2x / 12
996 = 800 + 2x
2x = 996 - 800
2x = 196
x = 196/2
= 98
Semoga membantu, jadikan terbaik ya !
Banyak data:10
jumlah:80×10=800
Rata rata:83
banyak data:12
Jumlah:996
Nilai 2 mahasiswa kelas a:996-800=196
Jadi,rata ratanya:196÷2=98