A grocery store sells 5-lb bags of apples. You purchase four bags over the course of a month and weigh the apples each time. You obtain the following measurements:

Week 1 weight: 4.8 lb

Week 2 weight: 5.3 lb

Week 3 weight: 4.9 lb

Week 4 weight: 5.4 lb

You determine that the weight of the 5-lb bag has an uncertainty of ± 0.4 lb. What is the percent uncertainty of the bag's weight?

Strategy
First, observe that the expected value of the bag’s weight, A , is 5 lb. The uncertainty in this value,δA , is 0.4 lb. We can use the following equation to determine the percent uncertainty of the weight:

Transcribed Image Text:

δΑ A % unc =- × 100%.