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Verified answer
Mean = jumlah datum/banyak datum7,5 = z (f.x) / f
7,5 = (5.20 + 6.17 + 7f + 8.10 + 9.8 + 10.6 + 11.7 + 12.6) / (20 + 17 + f + 10 + 8 + 6 + 7 + 6)
7,5 = (100 + 102 + 7f + 80 + 72 + 60 + 77 + 72) / (74 + f)
7,5 = (563 + 7f) / (74 +f)
7,5 x (74 + f) = 563 + 7f
555 + 7,5 f = 563 + 7f
7,5 f - 7f = 563 - 555
0,5f = 8
f = 8/0,5
= 16
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