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rata-rata = (( 4x2) + (5x3)+ ( 6x 4) + ( 7x8)+(8x9) + (9x2) + ( 10x2)) / jumlah data
= ( 8 + 15+ 24 + 56 + 72 + 18 + 20) / 30
= 213/30
= 7,1
jawabannya 7,1