Question: 7. The grades for a certain exam are normally distributed with mean 67 and variance 64. What percent of students get A( 90), B(80

7. The grades for a certain exam are normally distributed with mean 67 and variance 64. What percent of students get A(≥ 90), B(80 − 90), C(70 − 80), D(60 − 70), and F(< 60)?

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