IQ scores form a normal distribution with μ = 100 and σ = 15. Individuals with IQs between 90 and 110 are classified as average. What proportion of the population is average? a. 0.7486 b. 0.5028 c. 0.4972 d. 0.2486
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The distribution of the IQ (Intelligence Quotient) is approximately normal in shape with a mean of 100 and a standard deviation of 15. According to the standard deviation rule, only 0.15% of people have an IQ over what score? A. 55 B. 100 C. 115 D. 130 E. 145
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