(i) Calculate \(\Sigma(x - 62)\):

\((62.7 - 62) + (59.6 - 62) + (64.2 - 62) + (61.5 - 62) + (68.3 - 62) + (66.9 - 62) + (62.0 - 62) + (62.3 - 62) = 0.7 - 2.4 + 2.2 - 0.5 + 6.3 + 4.9 + 0 + 0.3 = 11.5\)

(ii) Calculate \(\Sigma(x - 62)^2\):

\((0.7)^2 + (-2.4)^2 + (2.2)^2 + (-0.5)^2 + (6.3)^2 + (4.9)^2 + (0)^2 + (0.3)^2 = 0.49 + 5.76 + 4.84 + 0.25 + 39.69 + 24.01 + 0 + 0.09 = 75.13\)

(iii) Calculate the mean and variance:

Mean \(= \frac{62.7 + 59.6 + 64.2 + 61.5 + 68.3 + 66.9 + 62.0 + 62.3}{8} = \frac{507.5}{8} = 63.4375\)

Variance \(= \frac{75.13}{8} - \left(\frac{11.5}{8}\right)^2 = 9.39125 - 2.06125 = 7.32\)