Probability: Normal Distribution: Example 1: IQ Scores

In this video I go over an example on normal distributions and this time look at the very well known application that follows a normal distribution probability density function, the Intelligence Quotient (IQ) scores. IQ tests have been widely used for about a century now and they, like many phenomena, are normally distributed. In the example I show that about 2/3rd of people (or 68%) have an IQ between 85 and 115 while less than 0.4% have an IQ higher than 140.

I also go over a brief history of the IQ tests as well its uses and drawbacks. IQ tests focus mainly on cognitive abilities such as memory, attention, speed, and pattern recognition. This is a very useful video if you are interested in learning more about the popular IQ testing concept so make sure to watch this video!

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