The flow rate was monitored for a week, and the following values were recorded a gal/min: 10.1, 12.2, 9.7, 8.8, 11.4, 12.9, 10.2, 10.5, 9.8, 11.5, 10.3, 9.3, 7.7, 10.2 10.0, and 11.3. Find the mean and the standard deviation for these data.