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nilai ujian > nilai rata² - 1
(nilai rata²) - 1 = ( 3+4+5+6+7+8+9 : 7) - 1
= 6 - 1
= 5
siswa yg tdk lulus :
nilai 3 = 3 orang
nilai 4 = 5 orang
nilai 5 = 12 orang
---------------------------------- +
20 orang
no. 5 bersambung =D