Key evidence & numbers
| Reference | Value | Limit |
|---|---|---|
| Common IQ scale mean | 100 | A norming convention, not a percentage correct. |
| Common standard deviation | 15 points | Describes the scale's spread. |
| A published child IQ scale's descriptive average band | 90–109 | This publisher's category; not a universal definition of a good score. |
Sources: scale convention, published child score guide, “About scores”. These values do not validate Helibrain's estimates.
What affects it?
The score guide explains that motivation, attention and learning opportunities can influence performance, and that scores contain measurement error. A confidence interval communicates that uncertainty better than treating the reported score as exact. Score guide
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Common questions
Is an IQ score a percentage?
No. It places performance on a standardized scale; it is not the share of questions answered correctly.
Can descriptive bands differ?
Yes. Use the interpretation supplied for the specific test. Do not mix its bands with another test's scoring system.
Can I say I am smarter than other people from this test?
Helibrain has not established the representative norms and validation needed for that claim.
Sources
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