Suppose that, for a certain exam, a teacher grades on a curve. 2.2% 2.2% 34.1% 34.1% 0.1% 0.1% 13.6% 13.6% µ-30 µ-20 p-lo u u+lo u+20 µ+3o It is known that the mean is 65 and the standard deviation is 5. There are 35 students in the class. What score would be necessary to obtain an A? or above

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A: Here use binomial distribution 

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