Because IQ is normally distributed in the population and 2.2% of individuals would be expected to earn IQ scores less than 70,the prevalence of intellectual disability is 2.2%.

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The prevalence of intellectual disability is generally estimated to be about 1% of the population, not 2.2%. The 2.2% figure refers to the percentage of people who might score below 70 on an IQ test due to the normal distribution, but not all of these individuals meet the diagnostic criteria for intellectual disability, which also requires significant limitations in adaptive behavior.

Because IQ Is Normally Distributed in the Population and 2