Exam grades across all sections of introductory statistics at a large university are approximately normally distributed with

Question:

Exam grades across all sections of introductory statistics at a large university are approximately normally distributed with a mean of 72 and a standard deviation of 11. Use the normal distribution to answer the following questions.
(a) What percent of students scored above a 90?
(b) What percent of students scored below a 60?
(c) If the lowest 5% of students will be required to attend peer tutoring sessions, what grade is the cutoff for being required to attend these sessions?
(d) If the highest 10% of students will be given a grade of A, what is the cutoff to get an A?

Distribution
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