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Rata-rata = Jumlah total/Frekuensi total
Rata-Rata x Frekuensi Total = Jumlah Total
6(20+40+70+p+10) = 4 x 20 + 5 x 40 + 6 x 70 + 8p + 10 x 10
6(140+p) = 80+200+420+8p+100
840+6p = 800+8p
2p = 40
p = 20