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= 50 x 6,1
= 305,0
total nilai kelompok 1
= 48 x 6,0
= 288,0
total nilai kelompok 2
= 305,0 - 288,0
= 17,0
orang di kelompok 2
= 50-48
=2
rata-rata nilai kelompok 2
= 17,0 / 2
= 8,5
maaf kalo kepanjangan dan semoga membantu :D