Rata rata ni Gimana caranya

Rata rata data = 90 / 9 = 10

simpangan rata rata
= (8-10)+ (10-10)+(9-10)+(10-10)+(11-10)+(10-10)+(11-10)+(10-10) +(11-10)/9

= 2+0+1+0+1+0+1+0+1/9

=6/9

=0,6 A