There are a couple of different ways to calculate weighted totals in Blackboard.  The following examples will help explain the differences between them.


To Calculate the Weighted Total by Item/Column:


Weighted by Column/Item
Points Possible
Points Earned by Student
Percentage
Homework 1
 A                   25
w                        24
      pA                    10%
Homework 2
B                   20
x                         20
pB                    15%
Paper
C                   50
y                         45
pC                    35%
Final
D                 100
z                         92
pD                    40%
Total Possible Points
                195
                     181
                     100%


Letters were added to these cells to help show the equation.  The equation used to calculate weighted total by column/item:


=((w/A) * pA) + ((x/B) * pB) + ((y/C) * pC) + ((z/D) * pD)


=((24/25) * .1) + ((20/.20) * .15) + ((45/50) * .35) + ((92/100) * .4)


= .096 +  .15 + .315 + .368


= .929 or 92.9%



To Calculate the Weighted Total by Category:


Weighted by Category
Points Possible
Points Earned by Student
Percentage by Category
Homework 1
10
10
Homework 15%
Homework 2
10
8

Homework 3
10
10

Quiz 1
25
23
Quizzes 20%
Quiz 2
25
24

Test 1
50
44
Tests 25%
Test 2
50
47

Discussion Board 1
15
15
Discussion Boards  10%
Discussion Board 2
15
15

Final
200
173
Final 30%
Total
410
369
100%


For each category, that percentage is being spread out across all the items in that category.  Most courses are held in a manner of a running total so Blackboard will only calculate a grade for a submission or columns that have a grade entered.  In this example, we are assuming all assignments have been turned in.


Category
Equation
Percentage Earned
Homework
((10/10) * .05 + ((8/10) * .05) + ((10/10) * .05)
.05 + .04 + .05 = .14%
Quizzes
((23/25) * .1) + ((24/25) * .1)
.092 + .096 = .188%
Tests
((44/50) * .125) + ((47/50) * .125)
.11 + .1175 = .2275%
Discussion Boards
((15/15) * .05) + ((15/15) * .05
.05 + .05 = .1%
Final
(173/200) * .3
.2595%
Total Weigted Grade
.14+.188+.2275+.1+.2595+.915
91.5%


Due to the weights in the categories, the weighted total is a little higher than it would have been if the grade was calculated solely on the total number of points accumulated.  


Total Points - 369/400 = 90%  

Weighted Total = 91.5%



If you have any questions or issues, contact Technology Support Services
419-434-4357
helpdesk@findlay.edu.