[gradebook2-dev] question about grading using letter grades

[Thomas Amsler]

Jim,

GB2 uses the following "letter grades" to "numeric values"mappings:

A+      98.3333333333
A       95
A-      91.6666666666
B+      88.3333333333
B       85
B-      81.6666666666
C+      78.3333333333
C       75
C-      71.6666666666
D+      68.3333333333
D       65
D-      61.6666666666
F       58.3333333333
0       0


96.66 - 100     A+
93.33 - 96.66   A
90 - 93.33              A-
86.66 - 90              B+
83.33 - 86.66   B
80 - 83.33      B-
76.66 - 80      C+
73.33 - 76.66   C
70 - 73.33      C-
66.66 - 70          D+
63.33 - 66.66   D
60 - 63.33      D-
<60             F

Best,
-- Thomas


On Wed, Nov 21, 2012 at 7:04 AM, Jim Mezzanotte <jmezzanotte at rsmart.com>wrote:

> I think the question here (apologies if I'm wrong) is how the
> gradebook arrives at a calculated grade when it's set up for entering
> letter grades for items. If you use the default "letter grades"
> format, you get the following ranges:
>
> A = 90 to 100
> B = 80 to 89.99
> C = 70 to 79.99
> D = 60 to 69.99
> F = 0 to 59.99
>
> Given these ranges, how does the tool determine the points for an
> entered score?  If you enter "F" for an item (assuming item has 100
> max pts)--and that is the only item graded--the calculated grade is
> 58.333...  So the tool is determining a specific value for each range,
> but it's not clear how. The midrange value for "F" would be 29.995. As
> another example, the midrange value for "C" would be 74.995. Yet, if
> you enter "C" for a single item, the calculated grade is 75.
>
> I'm not sure if the tool might be rounding up. You'll also see a
> discrepancy between midrange value and calculated grade with the
> default "letter grade with +/-" format. For example, if you enter "B-"
> for a single item, the calculated grade is 81.666....  But, the
> midrange value would be 80.995.
>
> Best,
> Jim Mezzanotte
> rSmart
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