Given a dataset XXX with n=10n=10n=10, ∑xi=100\sum x_i = 100∑xi=100, and ∑xi2=1200\sum x_i^2 = 1200∑xi2=1200. Calculate the sample variance s2s^2s2.
22.2222.2222.22
202020
252525
24.4424.4424.44