1, 5, 0, 2, 8, 0, 0, 7, 12, 1, 0
E(X) = (1 + 5 + 0 + 2 + 8 + 0 + 0 + 7 + 12 + 1 + 0)/11 = 36/11
Var(X) = ((1 - 36/11)^2 + (5 - 36/11)^2 + (0 - 36/11)^2 + (2 - 36/11)^2 + (8 - 36/11)^2 + (0 - 36/11)^2 + (0 - 36/11)^2 + (7 - 36/11)^2 + (12 - 36/11)^2 + (1 - 36/11)^2 + (0 - 36/11)^2)/11 = 1872/121 = 15.47107438
σ = √(1872/121) = 3.933328664
VarK(X) = √(1872/121) / (36/11) = 1.201850425