Download Figure 28.4 Normal Distribution Curves b. SAT® scores have a

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Figure 28.4 Normal Distribution Curves
a. Normal Distribution
b. SAT® scores have a normal distribution.
The mean, median, and mode all equal
500 and the standard deviation is 100.
Hence, approximately 68% of scores
fall within one SD of the mean, between
scores of 400 and 600, and only 2% of
students score below 300 and only 2%
score above 700.
c. IQ scores have a normal distribution.
The mean, median and mode equal 100
and the standard deviation is 15.
Approximately 68% of IQ scores are
between 85 and 115, with only 2.5% of
students scoring below 70 and only
2.5% scoring above 130.
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