Problem
Three students measure the length of the same pencil and they each get different results: 18.3 cm, 18 cm, and 18.1 cm. What is the average of their measurements?
Students in your biology class each measured the volume of water contained in a cup and calculated their % errors. If the % errors were 1.5%, -3.8%, 5%, -2.2%, 7.1%, -4.9% and -8.3% then what is the average % error of the volume measurements made by the students?