In more detail
Marks of 90, 80 and 70 weighted 40%, 30% and 30% give 81. Course grades work the same way, with credit hours as the weights.
Glossary
Math & Statistics
Weighted average
A weighted average gives each value a weight so that more important values count for more: `Σ(weight × value) / Σweight`.
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See also
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Glossary
Mean, median and mode
The mean is the sum divided by the count, the median is the middle value when sorted, and the mode is the most frequent value.
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Glossary
GPA
GPA (grade point average) is the credit-weighted average of course grades converted to points, commonly on a 4.0 scale.