Group 1 is the low-fat group, so see if it actually works. After 4 months, the mean weight loss was 9.31 pounds for group 1. Let me write this down. The mean weight loss for group 1, let me make it very clear. The low-fat group, the mean weight loss was 9.31 pounds. Our sample mean for group 1 is 9.31 pounds, with a sample standard deviation of 4.67. Both of these are obviously very easy to calculate from the actual data.