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OpenStudy (anonymous):
Score on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A's to the top 10% of the students. What is the bottom cutoff for A grade?
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OpenStudy (anonymous):
(0.57) = 0.1764 0.1764*9+70 = 71.5874 So round it up
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