Nilai. 4 5 6 7 8 9. Frekuensi. 3 8 10 11 6 2 nilai rata rata nya adalah?? A.37. B.29. C.21. D. 19

4 x 3 = 12
5 x 8 = 40
6 x 10=60
7 x 11 = 77
8 x 6 = 48
9 x 2 = 18

rata-rata = (12+40+60+77+48+18) : 40
rata-rata = 255 : 40
rata-rata = 6,375

kak kok ga ada jawabannya

4×3=12
5×8=40
6×10=60
7×11=77
8×6=48
9×2=18
12+40+60+77+48+18=260
3+8+10+11+6+2=40
260:40=6,50