A five-line mistake log: turn an error into the next practice question

A fictional worked example shows a student calculating the mean (5) when asked for the median (3) of 2, 3 and 10. Build a five-line mistake log: the prompt, the actual approach, a corrected rule with its source, a fresh question, and a later check with the note hidden. Then try 1, 4 and 10: its median is 4, while its mean is 5. Original nonclinical animation with local synthetic English narration; no real-person likeness. This is a practical study suggestion, not a promise of better grades. OpenStax supports the arithmetic definitions. Carnegie Mellon describes reflecting on the nature of errors; neither source supplied or endorsed this film or its five-line template. Try Recall: https://meyshan.com/app/recall