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6 x 3= 18
7 x 4= 28
8 x 6= 48
9 x 5= 45
10 x 1= 10
banyak siswa= 1+3+4+6+5+1= 20 siswa
rata2 (mean)= 5+18+28+48+45+10
= 154/ banyak siswa
= 154/20= 7,7
maka, rata2 nilai ulangan matematika kelas VI adalah 7,7
jawaban: d. 7,7