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    Normal Distributions and Standard Deviation

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    According to the 1996 Statistical Abstract of the United States, 7.6% of the scores on the verbal portion of the Scholastic Aptitude Test (SAT) exceeded 600. Approximately, 42.3% of the cores were less than 400, according to the same reference. Assuming that scores on the verbal portion of the Scholastic Aptitude Test are approximately normally distributed, what are the mean and the standard deviation of the scores on the verbal portion of the Scholastic Aptitude Test?

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