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Nilai rata2 4 siswa= 7,54
nilai rata2 ditambah 1 siswa = 7,25
maka :
Nilai 4 siswa = 7,54 x 4 = 30,16
Nilai 5 siswa = 7,25 x 5 = 36,25
jadi nilai siswa ke 5 = 36,25 - 30,16 = 6,09 = 6 (C)