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Level 4 · ◆◆ · ~11 min

The Standard Deviation

The Standard Deviation

"One number for spread: how far, typically, is a value from the average?"

deviationsroot-mean-squarestandard deviationspreadthe 68% preview
🚀 You're jumping ahead. This builds on The Average & the Median — but play it now and you'll still earn full XP. If it feels steep, those make a gentler on-ramp.

A short lesson, then a quiz. ❤️×3 — a wrong answer costs a heart; finish with at least one left and the level is yours. Lose all three and you'll have to try again. Replay any time — XP and cleared levels are never lost.