Question 1192579
mean is 1*10/33 +2*11/33+3*12/33
=68/33 or 2.06
variance is (-1.06)^2(10/33)+(-0.06)^2(11/33)+ 0.94^2 (12/33)
=0.34+0.12+0.32
=0.78
sd is sqrt(0.78)=0.88