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If the random variable X has a mean of µ and a standard deviation then (X - µ) / has a mean and standard deviation respectively:
Intelligence
The capacity for learning, understanding, problem-solving, and adapting to new situations.
Identical Twins
Twins who develop from a single fertilized egg that splits and forms two embryos, sharing identical genetic material.
IQ Scores
Quantitative measurements used to assess a person's intellectual capabilities relative to others.
Siblings
Brothers or sisters, including full, half, step, and adoptive relatives who share a common parent or guardian.
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