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frekuensi
7.8 = (5 x 2) + (6 x 4) + (7 x 5A) + (8 x12) + (9 x 4A) + (10 x 4)
2 + 4 + 5A + 12 + 4A + 4
7.8 = 10 + 24 + 35A + 96 + 36A + 40
22 + 9A
7.8 = 170 + 71A
22 + 9A
7.8(22 + 9A) = 170 + 71A
171.6 + 70.2A = 170 + 71 A
1.6 = 0,8A
A = 1.6 : 0.8
A = 2
Nilai yang kurang dari 8
= 2 + 4 + (5 x 2)
= 2 + 4 + 10
= 16 (D)
Maaf kalau salah