"mean grade" is correct and usable in written English.
You can use it in a variety of contexts to refer to an average grade, such as in the sentence: "Based on the data collected, the mean grade across all classes was an A-."
Successful candidates had a mean grade point average of 3.6.
The overall mean grade of the experienced tutor was 14.6.
The overall mean grade over the three problems was 14.3 for those with solutions and 14.5 without.
Serpentine had a mean grade of approximately 0.77 wt.% Ni and represented approximately 81.49 wt.% of the total laterite resource.
None of the Ivies did, though Wellesley College in 2004 instituted guidelines that the mean grade for 100- and 200-level classes should not exceed a B+.
The mean grade of mucositis was significantly lower for the tongue than for the palate from irradiation fraction six until two weeks after irradiation.
* The latest year for which I could find an estimate of mean grade was 2005, where it was 3.45 (a B-plus).
Candidates for bachelor's degrees in education had a mean grade point average of 3.24, well above the average entrance requirement of 2.6.
The guidelines "preserved the credibility of every Wellesley transcript," said provost Andrew Shennan, by lowering the mean grade from 3.53 in 2001 to 3.34 in 2011 and reducing grading imbalances between the sciences and humanities.
In 2004, Wellesley College adopted guidelines setting the expectation that the mean grade for 100- and 200-level classes with more than 10 students should not exceed a 3.3 or B+.
Acute radiation mucositis gradually increased for the palate and tongue after approximately six irradiation fractions (maximal mean grade: palate, 2.5 during radiation fractions 15; tongue, 0.8 during radiation fractions 12 and 13).
