We need to unify how we calculate averages on grade report pages. Currently we have these 2 old functions:

1. get_right_avg_row() in grade/report/grader/lib.php
2. calculate_averages() in grade/report/user/lib.php

And we also have this new function

• calculate_average() in grade/report/lib.php

The last one was created in MDL-75156 and is based on existing functions. It is covered by unit tests (while old functions are not) . We should deprecated get_right_avg_row() and calculate_averages() so we have only one source of truth