Results of 2018 midterm exam:
Mean score was 93.9%
S.D = 9.3%
Median = 94.9%
Highest score was 105.1%
There were a total of 82 points available (including extra credit).
Your percent score can be calculated by the formula:
100*(82 - X)/78
where X is the number of missed points.
If all answers, including all extra credit questions, are correct, then
X=0 and score would be 100*(82/78) = 105.1%