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Verified answer
Jumlah nilai 7 bilangan = 7 x 65= 455
Jumlah nilai 13 bilangan = 13 x 72
= 936
Jumlah nilai 20 bilangan = 455 + 936
= 1.391
Rata-rata 20 bilangan = Jumlah nilai / 20
= 1.391 / 20
= 69,55