Final answer:
To find the weight of each bag, add the weight of the green and red grapes and then divide by the number of bags.
Step-by-step explanation:
To find the weight of each bag, we need to divide the total weight of the grapes by the number of bags. First, add the weight of the green and red grapes together: 5.68 + 3.08 = 8.76 pounds. Then, divide this total weight by the number of bags, which is 13: 8.76 / 13 = 0.672 pounds per bag. Therefore, each bag weighs approximately 0.672 pounds.