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JAWAB
Rata-rata = Jumlah dari (nilai × frekuensi)/ jumlah frekuensi
⇨6 = [(4×20) + (5×40) + (6×70) + (8×a) + (10×10)] / (20+40+70+a+10)
⇨ 6 = (80+200+420+8a+100)/(140+a)
⇨ 6 = (800+8a) / (140+a)
⇨ 6 × (140+a) = 800 + 8a
⇨ 840 + 6a = 800 + 8a
⇨ 840 - 800 = 8a - 6a
⇨ 40 = 2a
⇨ a = 40/2
⇨ a = 20