Jawabanmu

2014-05-20T19:16:35+07:00
Mean : (5x3)+(6x5)+(7x4)+(8x6)+(9x1) / 19
= 15+30+28+48+9 / 19
= 130 / 19
= 6,84
2014-05-20T19:52:37+07:00
mean =  \frac{(5.3+6.5+7.4+8.6+9.1)}{3+5+4+6+1}  \\ =\frac{(15+30+28+48+9)}{19} \\ = \frac{130}{19}  \\ = 6,84

seorang siswa dinyatakan lulus jika nilainya diatas 6,84

maaf kalau salah:)