Do quarter grades always count equally?

No. Schools can weight quarters and exams differently.

Can I solve for a missing final exam score?

Yes, if the current grade and all weights are known and the resulting target is feasible.

See how category weights, quarter averages, and final exams combine—and why the grading policy must be stated.

A quarter grade summarizes one grading period. A semester grade combines quarters and often a final exam using weights set by the school or teacher.

Weighted average = Σ(value×weight) / Σweight

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