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- 4×20 = 80
- 5 × 40 = 200
- 6 × 70 = 420
- 8 × a = a...= 20
- 10 ×10 = 100
ditanya ?
rata rata = hasil penjumlahan dari nilai ulangan : hasil penjumlahan frekuensi =
960 : 160 = 6