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7 = (5×4 + 6×p + 7×14 + 8×12 + 9×2) : (4 + p + 14 + 12 + 2)
7 = (20 + 6p + 98 + 96 + 18) : (32 + p)
7(32 + p) = 232 + 6p
224 + 7p = 232 + 6p
7p - 6p = 232 - 224
p = 8
Median.
Jumlah data = 40
Median = (data ke-20 + data ke-21) : 2
= (7 + 7) : 2
= 7