1. Final Grade Averages
Weighted Averages

2. Weighted Averages
When a weighted average is applied to a set of numbers, more importance (weight) is placed on some components of the set. Your final average in this class is probably an example of a weighted average.

3. Final Grade Averages Exams 40% Quiz 30% Assignments 20%
Percentage Given
Grade Earned
Exams 40%
Quiz 30%
Assignments 20%
9 Weeks Exam 10%
Exams 84
Quiz 66
Assignments 88
9 Weeks Exam 78

4. Procedures to get final grade average:
84 x .4 = 33.6
66 x .3 = 19.8
88 x .2 = 17.6
78 x .1 = 7.8
First multiply the average grade by the weighted percentage.
Percentage must be changed to decimal.
Then add the results to get the final grade.
Final Grade: = 78.8

5. What if not all of the grades are averaged?
Exam Grades: 82, 76, 66, 88
Quiz 66
Assignments 88
9 Weeks Exam 78
In this case exam grades. Average the exam grades first.
= / 4 = x .40 = 31.2
Quiz 66 x .30 = 19.8
Assignments 88 x .20 = 17.6
9 Weeks Exam 78 x .10 = 7.8
Final Grade: = 76.4

6. Your averages and values are the following:
Exam average = 87
Quiz average = 92
Assignments = 95
What grade do you need on the final exam to earn a final grade average of at least 90 to make an A?
87 • .4 = 34.8
92 • .3 = 27.6
95 • .2 = 19
= 81.4
x (.10) = 90
x (.10) = x = 86