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The distribution of course grades in a very large class is (approximately) Normal with mean 50 and standard deviation 10.The minimum possible grade is 0

The distribution of course grades in a very large class is (approximately) Normal with mean 50 and standard deviation 10.The minimum possible grade is 0 and the maximum possible grade is 120. A grade of90or more is required to get "A+".The course instructor is considering the possibility of a "bell curve" that will increase the mean grade to 73 and decrease the standard deviation to 7.What is the portion of students that will get "A+" if the bell curve is applied?

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