For example , a breakfast cereal packaging line may be designed to fill each cereal box with 500 grams of cereal . Some boxes will have slightly more than 500 grams , and some will have slightly less .
For example , a breakfast cereal packaging line may be designed to fill each cereal box with 500 grams of product , but some boxes will have slightly more than 500 grams , and some will have slightly less , in accordance with a distribution of net weights .