Some teachers use a weighted mean to calculate grades. Each score is assigned a weight based on its importance. To find a weighted mean, multiply each score by its weight and add the results. For example, a students final chemistry grade is based on four sources: 40% from lab reports, 10% from quizzes, 20% from the midterm exam, and 30% from the final exam. What is the student’s weight mean given the scores shown in the table?
