Standard Deviation and variance math problem

The length (pgs) of math research projects is given below. Using this information, calculate the variance, and standard deviation.

31 17 20 17 27 23 13 46 34 39 19

Mean = (31+17+20+17+27+23+13+46+34+39+19)*(1/11… = 26

S^2 = (31^2+17^2+20^2+17^2+27^2+23^2+13^2+46^2… = 108.4

SD = sqrt(108.4) = 10.41153207