Jawabanmu

2014-04-04T15:38:28+07:00
X-x-x-x-x-x-x-x=20
modus=x+x=40
median+40 dibagi 20=2
2014-04-04T15:39:01+07:00
{(x+2)+(2x-1)+x+3x+5x}/5 = 7
[x+2+2x-1+9x] = 7x5
1+12x = 35
12x = 35-1
x = 34/12 
x = 2,83
mediannya, di rubah dulu : 4,83;4,67;2,83;8,50;14,15
di urutkan: 2,83;4,67;4,83;8,50;14,15
mediannya: 4,83
modusnya = gak ada.