That is, x+y=20.

Variance = [(9-10) 2+(10-10) 2+(110) 2+(x-/kloc-0)

(x- 10) 2+(y- 10) 2 = 8 (*)

X=20-y from x+y=20.

Substituting formula (*) gives (10-y) 2+(y- 10) 2 = 8.

2*(y- 10)^2=8

y= 10 2

Y 1= 12 y2=8 and x 1=8 x2= 12.

Collate data 9.10.11.8.12.