Your math is wrong - genius

by Don McHenry
(Harrisburg, PA USA)

Pertaining to:

Distribution OF IQ Score

Mr. Terman has distributed IQ scores on the following scales:

50% of IQ scores fall between 90 and 110
70% of IQ scores fall between 85 and 115
95% of IQ scores fall between 70 and 130
99.5% of IQ scores fall between 60 and 140
5% of people have an IQ below 70

If, as you state in your article, "95% of IQ scores fall between 70 and 130", then 5% fall outside the bell curve (gaussian distribution). That would mean that the total 5% is split between the values below 70 (to the left of the curve) and the values above 130 (to the right of the curve). This would obviously be 5% DIVIDED BY TWO, i.e. 2.5%. Which would invalidate the statement "5% of people have an IQ below 70". And, would also invalidate the follow up statement that "There is nothing personal but this 5% population demands special attention.".

As an example: In the attached distribution curve (distributioncurve.jpg) from, it actually shows 2.2%@70 and 97.8%@130 respectively.

You're Welcome

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to IQ Tests.

Recent Articles


    Jan 12, 17 04:40 PM

    Y'all people, well the majority of these people down in the comment are are bragging and being petty. Like seriously, stop saying what your IQ is especially

    Read More

  2. Not being able to pay attention does not mean that you don't know what is happening around you...

    Jan 12, 17 03:38 PM

    I took an IQ test at the age of 6 to test my condition, ADHD. Well it turns out my mental age was 24, so that would mean I came out with an IQ of 144 at

    Read More

  3. Wonderlic Test Preparation

    Dec 20, 16 03:10 PM

    Wonderlic test preparation is a must if you are planning to face one for your job.

    Read More