x1^2+x2^2+…+x10^2=1723(x1+x2+…x10)/10=13所以x1+x2+…x10=130方差=(x1-13)^2+(x2-13)^2+…+(x10-13)^2=(x1^2+x2^2+…+x10^2)-2×13(x1+x2+…x10)+10×13^2=1723-26×130+1690=33