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Dik: rata2 20 bilangan 41,18 bilangan rata-rata 36
7 bilangan rata-rata 42
dit: berapa rata2 5 yg lain ?
jawab:
41,1x20=822
36x8= 288
7x42= 294
jadi 288+294=582
822-582=240
maka 240/5=48
jadi bilangan yg 5 adalah bernilai rata-rata 48