What rings without making a sound, and yet is often found in a classroom?

Category: Wordplay · Difficulty: hard

Hint: Think about statistics and assessments.

Answer

A bell curve

Explanation

A 'bell curve' is a statistical concept but plays on the word 'bell' which rings.

This is a hard wordplay riddle — a tricky one that takes a little thought. The answer is A bell curve.

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