Simplify the expression 
Definitions:
Mean Score
The arithmetic average obtained by adding together all the scores and dividing by the number of scores.
Standard Deviation
A measure of the amount of variation or dispersion in a set of values.
IQ Tests
Standardized tests designed to measure human intelligence and cognitive abilities in comparison to an age-specific normative population.
Flynn Effect
The observed rise over time in standardized intelligence test scores, thought to reflect changes in environmental factors.
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