# Stanford-Binet Test: Normal Distribution and Standard Deviation

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If IQ scores on a Stanford-Binet Test are normally distributed with a mean of 100 and a standard deviation of 15, then about how many people in a randomly chosen million would be expected to score at 160 or above? (This was at one time the break off score for the "genius" designation.)

a) 47

b) 32

c) 16

d) 5

e) None of the above

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