Don't copy the answer: repair one mistake

A wrong answer can reveal a specific mismatch. In this original fictional example, a learner calculates the mean of 2, 3 and 10 when asked for the median. Follow the repair: record the prompt, your actual approach, the corrected rule and source, a fresh question, and a later check. The median of 2, 3 and 10 is 3. For the new example 1, 4 and 10, the median is 4; both examples have mean 5. This is nonclinical study practice, not a promise of improved grades. Original animation with synthetic English narration. Try Recall: https://meyshan.com/app/recall