Praxis — An adaptive tutor that shows its working Guest learner

Probability & Statistics › Describing data

0/0 this session +0 XP
Numeric Introductory median ~40s

Find the median of: 3, 7, 2, 9, 4

Fractions, decimals and π are all understood.

Hints are free to take and they are counted. A correct answer after two hints moves your mastery less than one without — which is the honest way to score it.

Why this question? this skill is new to you; the difficulty is about right — roughly 83% chance you get it; and it needs calibrating — few people have tried it Predicted chance you get it: 83% — the selector aims at 78%.
difficulty fit 0.913
skill need 0.75
review boost 0
calibration bonus 0.12
recency penalty 0
repetition penalty 0
frustration 0