Over the last 50 years or so, what have psychologists had to do in order to make sure the mean score on an IQ test remains at 100?

Name: Over the last 50 years or so, what have psychologists had to do in order to make sure the mean score on an IQ test remains at 100?
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Psychologists have had to make the test harder over time to account for the Flynn effect, which is the observed rise in IQ scores over the decades. This adjustment ensures that the average score remains at 100.

Over the Last 50 Years or So, What Have Psychologists