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You can swing your legs to and fro more frequently when your legs are
Jean Piaget
A psychologist from Switzerland renowned for his groundbreaking contributions to the study of child development, especially his cognitive development theory.
Paul Ekman
A psychologist renowned for his research on the classification of human emotions and their expression through facial expressions.
Median
The middle value in a data set, which divides the set into two equal halves.
Mode
describes the value that appears most frequently in a data set.
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