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It's in the definition of the IQ (assuming a bell curve distribution)

Modern IQ tests are normalized with mean 100 and standard deviation 15. https://en.wikipedia.org/wiki/Intelligence_quotient

m0rissette says> "I just woke up so don’t feel like fact checking this. Is the population really that mentally challenged? Can you provide a reference to your statistic?[i.e. parent statement: 'Remember that ~50% of the population has IQ less than 100.']<"

Thanks for the laugh!8-)) Now go have a cup of coffee.