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5 4 20
6 p 6p
7 14 98
8 12 96
9 2 18
Jumlah 32 + p 232 + 6p
Mean = (232 + 6p) / (32 + p)
7 = (232 + 6p) / (32 + p)
7(32 + p) = 232 + 6p
224 + 7p = 232 + 6p
p = 8