To recalculate the average score, you need to know how many people are in the class.

Assuming there are 30 people, recalculate the average score:

(30×92.3-98+89)÷30

=92.3-9÷30

=92.3-0.3

=92

If it is 30 people, recalculate the average score, which is 92.0 points.