Grabbing the mean when the SAT asked for the median
The list is right there, the word 'median' is right there — and you still computed the mean, because computing feels like progress.
Why it happens
Mean has a formula; median has a procedure (sort, then pick). Brains prefer formulas under time pressure, so the formula fires first.
See the trap
Find the median of 3, 9, 4, 4, 10.
✗ The trap: (3 + 9 + 4 + 4 + 10)/5 = 6.
✓ The fix: Sort: 3, 4, 4, 9, 10 → middle value = 4.
How to actually fix it
- Circle the statistic word in the question before touching numbers.
- Median means SORT FIRST — no sorting, no median.
- For even counts, average the middle two.
Made this mistake on a real question?
Practice Problem-Solving and Data Analysis questions here. Miss one and it is logged with the exact error, then brought back until you beat it.
Practice Problem-Solving and Data Analysis →FAQ
When do mean and median differ most?
With outliers. One huge value drags the mean but leaves the median alone — which is exactly what the SAT loves to test.
How do I stop repeating this mistake?
Reading the explanation isn't enough — your brain needs to beat the trap on a fresh question. Practice the skill in the kaoshen.co question bank: miss one and it is logged with the exact error, then brought back to you three days later and again after fourteen.