Scores on a standardized test are approximately normally distributed with a mean of 480 and a standard

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Scores on a standardized test are approximately normally distributed with a mean of 480 and a standard deviation of 90.
a. What proportion of the scores are above 700?
b. What is the 25th percentile of the scores?
c. If someone's score is 600, what percentile is she on?
d. What proportion of the scores are between 420 and 520?
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