The document shows the class grades and weights for a student to calculate their class average. It includes the component, percent weight, grade received, and weighted grade for each assignment. The weighted grades are summed to get the total weighted points, which is divided by the sum of the weights to calculate the class average of 82.9, earning the student a B.

1. 3.1 - 1
Desk Work 6: Class Average
In our class your course grade or average is
determined by the following weights given in our
syllabus.
Component Percent
Test 1 15%
Test 2 15%
Test 3 15%
Web based Homework
Assignments 20%
Project 10%
Final 25%

2. 3.1 - 2
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent Grade
Test 1 15% 76
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79

3. 3.1 - 3
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent Grade
Test 1 15% 76
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
Class average is calculated using a weighted mean

4. 3.1 - 4
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent Grade
Test 1 15% 76
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
Class average is calculated using a weighted mean
∑
∑ ⋅
=
w
xw
X
)(

5. 3.1 - 5
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x
Test 1 15% 76
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
Class average is calculated using a weighted mean
→ the grades are your x variable
→ the percentages are your weights w

6. 3.1 - 6
Example 10: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x
Test 1 15% 76
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

7. 3.1 - 7
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

8. 3.1 - 8
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

9. 3.1 - 9
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

10. 3.1 - 10
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100
Project 10% 100
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

11. 3.1 - 11
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

12. 3.1 - 12
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

13. 3.1 - 13
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
∑
∑ ⋅
=
w
xw
X
)( Create a column for w∙x

14. 3.1 - 14
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
∑
∑ ⋅
=
w
xw
X
)( Sum the column for w∙x

15. 3.1 - 15
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
∑
∑ ⋅
=
w
xw
X
)( Sum the column for w∙x
Σ(w∙x) = 8290

16. 3.1 - 16
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
∑
∑ ⋅
=
w
xw
X
)(
Sum the column of w
Σ(w∙x) = 8290

17. 3.1 - 17
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
∑
∑ ⋅
=
w
xw
X
)( Sum the column for w∙x
Σ(w∙x) = 8290Σw = 100

18. 3.1 - 18
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
∑
∑ ⋅
=
w
xw
X
)(
Σ(w∙x) = 8290Σw = 100

19. 3.1 - 19
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
100
8290)(
=
⋅
=
∑
∑
w
xw
X
Σ(w∙x) = 8290Σw = 100

20. 3.1 - 20
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
9.82
100
8290)(
==
⋅
=
∑
∑
w
xw
X
Σ(w∙x) = 8290Σw = 100

21. 3.1 - 21
Desk Work 6: Class Average
Calculate a students class average based on the
following grades.
Component Percent, w Grade, x w∙x
Test 1 15% 76 15(76) = 1140
Test 2 15% 68 15(68) = 1020
Test 3 15% 77 15(77) = 1155
Web based Homework
Assignments 20% 100 20(100) = 2000
Project 10% 100 10(100) = 1000
Final 25% 79 25(79) = 1975
9.82
100
8290)(
==
⋅
=
∑
∑
w
xw
X
Σ(w∙x) = 8290Σw = 100
This student’s class
average is an 82.9
or a B.