tolong pake cara jangan diawur

Banyak data
=(120×1)+(121×6)+(122×10)+(123×14)+(124×8)+(125×1)
=120+726+1220+1722+992+125
=4905
Jumlah data=1+6+10+14+8+1=40
Rata²=Banyak Data/Jumlah Data
=4905/40
=122,625

(120×1)+(121×6)+(122×10)+(123×14)+(124×8)+(125×1) ÷ 40
120+726+1220+1722+992+125 ÷ 40
4905÷40 = 122.625(C)