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addition allowed answer applied arithmetic average better Binet's tests boys central tendency child correct correlation count Crito curve Cyril Burt deviation devised difficulty distinct draw English error Evaluation examination example fact girls give given grades habit hand instance Instructions intelligence intelligence quotient interquartile range investigators J. A. Green Karl Pearson knowledge large number least London marks mean deviation measure mechanical median memory mental age mental tests merely method metic mind minuend motor ability naughty dog never normal distribution norms number of children oral paper pennies phrenology piece practice principle processes proficiency psychologist pupil quartile questions reason regarded repeat scale score sentence simple Socrates Soph Sophisticus spelling standard standardised tests subtraction sums supposed syllables tapping teacher teaching tell thing tion Weber-Fechner law