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Seorang siswa telah mengikuti tes sebanyak n kali dan memperoleh nilai rata- rata 80. Berapakah nilai yang harus dia peroleh pada tes selanjutnya agar nilai rata-ratanya menjadi 82?
(A) 2n — 82
(B) n + 82
(C) 2n + 82
(D) 2n + 80
(E) 2n — 80
3 Answers
- Anonymous9 years agoFavorite Answer
80n + x = 82(n + 1)
x = 2n + 82
- 9 years ago
C. 2n + 82
misal: x = nilai yg harus dia peroleh
mean = f(x) / f
82 = (80n + x) / (n + 1)
82n + 82 = 80n + x
x = 2n + 82
- 9 years ago
Rata-rata baru = (jumlah nilai lama + nilai selanjutnya) / total tes
82 = (80n + x) / (n + 1)
82 (n + 1) = 80n + x
82n + 82 = 80n + x
2n + 82 = x
(C)
