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5. The scores on an adult intelligence test are approximately normal with = 100 and = 15. a. How many standard deviations below the mean

5. The scores on an adult intelligence test are approximately normal with = 100 and = 15.

a. How many standard deviations below the mean is a test score of 91?

b. What is the proportion of adults with scores above 130?

c. What is the proportion of adults with scores between 90 and 110? d. How high of a score is needed to be in the top 5%?

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