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1).n=150 karung.
    75 karung = 50 kg
    50 karung = 25 kg
    25 karung = 10 kg

Berat rata-rata
XRata-rata=(50x75)+(25x50)+(10x25)/150
XRata-rata=3750+1250+250/150
XRata-rata=5250/150
XRata-rata=35 kg/karung

2.)Senin=80 kg
     Selasa=60 kg
     Rabu=100 kg
     Kamis=75 kg
     Jum'at=65 kg
     Sabtu=70 kg

XRata-rata=80+60+100+75+65+70/7
XRata-rata=490/7
XRata-rata=70 kg

3.)10,8,9,6
 
Rata-rata=10+8+9+6/4
Rata-rata=33/4
Rata-rata=8,25

8,25=33+u5/5
41,25=33+u5
8,25=u5

4.)Modus=6

5.)

7,8=x/9
x=70,2

x=70,2+9/10
x=79,2/10
x=7,92