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nilai 2 6 7 8 9 10
rata-rata = ( 2x2 ) + ( 3x6 ) + ( 7x5 ) + ( 4x8 ) + ( 4x9 ) + ( 2x10 )
jumlah frekuensi
rata-rata = 145 = 7,25
20
Sempga membantu ya :D