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= 26 × 55
= 1430
Total nilai 25 siswa
= 1430 - 80
= 1350
Rata" nilai 25 siswa
= 1350 : 25
= 54
1 x 80 = 80 -
25 x r = 1350
r = 1350 : 25= 54
jadi rata2 baru adalah 54