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= 16+10+36+35+24/20
= 121/20
= 6,05
IXB = 4.3+5.7+6.4+7.4+8.2/20
= 12+35+24+28+16/20
= 115/20
= 5,75
selisih= 6,05-5,75=0,30
rata-rata nilai kelas IX-B : 5,75
selisih rata2 nila kelas IX-A dan IX-B adalah :6,05-5,75=0,3
jadi selisihnya adalah 0,3