Weigh your backpack after school each weekday. Make a chart. Record how many pounds your backpack weighed. Compare your results with your friends.
According to the PBS Kids Challenge (http://pbskids.org/zoom/fromyou/backpack/index.shtml), the boys' back packs averaged 15.8 pounds per day, while girls' averaged 13.9 pounds. Thursday is the day with the heaviest pack, with an average weight of 14.8 pounds. At 13.8 pounds,
Monday has the lightest average weight.