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A college entrance exam has two parts: mathematical and verbal

A college entrance exam has two parts: mathematical and verbal. The scores for each part are normally distrubuted with a mean of 500 and a standard deviation of 100. What is the probability that a student's score on one part is between 400 and 500? What is the probability that student's score on one part is 700 or above? Susanna's math score and verbal score were both more than one standard deviation above the mean but less than two standard deviations above the mean. What was the range of her possible combined scores?

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