2 The masses, \(x \mathrm {~kg}\), of 50 bags of flour were measured and the results were summarised as follows.
$$n = 50 \quad \Sigma ( x - 1.5 ) = 1.4 \quad \Sigma ( x - 1.5 ) ^ { 2 } = 0.05$$
Calculate the mean and standard deviation of the masses of these bags of flour.