Key evidence an nummers
| Reference | Value | Limit |
|---|---|---|
| Common IQ scale mean | 100 | A convention for settin norms, no a percentage correct. |
| Common standard deviation | 15 points | Describes the spread o the scale. |
| Descriptive average band for a published child IQ scale | 90–109 | This publisher’s category; no a universal definition o a guid score. |
Sources: scale convention, published child score guide, “About scores”. Thae values dinnae validate Helibrain’s estimates.
Whit affects it?
The score guide explains that motivation, attention an opportunities tae learn can influence performance, an that scores contain measurement error. A confidence interval gies a better sense o that uncertainty than treatin the reported score as exact. Score guide
Gie the related free test a try
IQ test
Test yersel: IQ-style tasks. Try out reasoning, memory an related tasks, but dinnae tak the result as a verdict on yer ability.
Common questions
Is an IQ score a percentage?
Naw. It sets performance on a standardised scale; it isnae the share o questions answered richt.
Can descriptive bands differ?
Aye. Use the interpretation providit for that specific test. Dinnae mix its bands wi the score system o anither test.
Can I say I’m cleverer than ither fowk based on this test?
Helibrain hasnae established the representative norms an validation needed tae mak that claim.
Sources
Cite this page: Whit’s a guid IQ score?. Helibrain. 2026. https://helibrain.com/sco/answers/what-is-a-good-iq-score. CC BY 4.0.
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