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The intelligence quotient (IQ) is normally distributed across the population with a mean of 100 and a standard deviation of 15. So about what percentage

The intelligence quotient (IQ) is normally distributed across the population with a mean of 100 and a standard deviation of 15. So about what percentage of the population has an IQ between 100 and 130?

a. 95%

b. 68%

c. 47.5%

d. 34%

e. 50%

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