(Answered) Question an instructor graded a large number of midterm

Statistics

Question: An instructor graded a large number of midterm exams and she considers that the test scores are normally distributed with a mean of 70 and a standard deviation of 10.

(a) What is the portion of students obtaining scores between 85 and 95?

(b) What is the score needed to be at the top 10% of the class?

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