7) mean = nilai rata-rata
100 + 100 + 90 + 90 + 80 + 80 + 80 + 80 + 80 + 80 + 80 + 70 + 70 + 70 + 70 + 70 + 70 + 60 + 60 + 60 = 1,540
mean = 1,540 ÷ 20
= 77
8) median = nilai tengah = 80
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7) mean = nilai rata-rata
100 + 100 + 90 + 90 + 80 + 80 + 80 + 80 + 80 + 80 + 80 + 70 + 70 + 70 + 70 + 70 + 70 + 60 + 60 + 60 = 1,540
mean = 1,540 ÷ 20
= 77
8) median = nilai tengah = 80