First we need to convert the given weight to pounds and then divide this weight in pounds by the number of days to find the number of pounds lost each day.
Weight in kilograms = 28 kg
Since 1 kg = 2.2 pounds
The weight that club members lose in pounds = 28 x 2.2 = 61.6 pounds
61.6 pounds weight was lost in 7 days. So the number of pounds lost each day will be = 61.6 / 7 = 8.8 pounds
This means, the group lost 8.8 pounds each day.