Rebuilding a Mean From Deviations

A physics lecturer never stores raw marks. For each of her $22$ students she records only the deviation of that student's mark from $65$, that is $x_i - 65$.

At the end of marking, those $22$ deviations add up to $-84$.

Three scripts are then re-marked, and the lecturer adjusts three individual marks by

$+6, \qquad +11, \qquad -5$

No student is added to or removed from the class.

What is the class mean mark after the re-marking?

Round your answer to two decimal places.