bantu jawab..........?
[tex]\sf{mean \: = \frac{(6 \times 7) + (7 \times 9) + (8 \times 12) + (9 \times 5) + (10 \times 2)}{35} }[/tex]
[tex]\sf{mean \: = \frac{42 \: + \: 63 \: + \: 96 \: + \: 45 \: + \: 20}{35} }[/tex]
[tex]\sf{mean \: = \frac{266}{35} }[/tex]
[tex]\sf{mean \: = 7,6}[/tex]
