$Id: CourseGrade.java 105077 2012-02-24 22:54:29Z email@example.com $
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A CourseGrade is a GradableObject that represents the overall course grade
in a gradebook.
Calculate the mean course grade (whether entered or calulated) as a
percentage for all enrollments, leaving
students who've explicitly been given non-percentage-valued manual-only
course grades (such as "I" for incomplete) or null scores out of the calculation.
int numScored = numEnrollments - gradeRecords.size();