snipped-for-privacy@hatespam.com (Psych Minor) wrote in news: snipped-for-privacy@news.houston.sbcglobal.net:
"D>
>>Anyway, that guys IQ is 75 and 100 is considered average (whatever
>>that means), I don't want to get into all the usual debates about what
>>IQ means (regarding race, environment, etc.), but can you explain how
>>the scale of IQ works?
>
> Yes, but you'll need to think back to that statistics class you took
> way back when...
>
> IQ is based on the idea that human intelligence falls on a normal
> distribution (bell) curve.
>
> 100 is arbitrarily decided to be the mean of the distribution, and so
> someone with a 100 IQ would be exactly average - 50% would be higher > and 50% lower.
>
> Every 15 (16 on some tests) points is assigned to be 1 standard
> deviation. So, if you have an IQ of 115, you are 1 standard deviation
> above the mean, and so you are in the top 16%.
>
> Here's a quick chart:
>
> IQ Percent with higher IQ
> -- ----------------------
> 40 99.997%
> 55 99.865%
> 70 97.725%
> 85 84.134%
> 100 50.0%
> 115 15.866%
> 130 2.275%
> 145 .135%
> 160 .003%
>
Are you serious? Over 160 is *only* .003% of the population...?
Well *that* explains a heck of a lot...