Question

find the mean of 8,9,-11,9,1,3,12,7,6​

Answer 1

The meaning of

8=+8

9=+9

-11=(-11)

9=+9

1=+1

3=(+3)

12=(+12)

7=(+7)

6=(6)

Answer 2

Mean = sum of all observations/total number of observations
= 8+9+(-11)+9+1+3+12+7+6/9
= 8+9-11+9+1+3+12+7+6/9
= 44/9
= 4.88


Hope it helps:)