Scores on a marketing exam are known to be normally
Scores on a marketing exam are known to be normally distributed with mean and standard deviation of 60 and 20, respectively.
a. Find the probability that a randomly selected student scores between 50 and 80.
b. Find the probability that a randomly selected student scores between 20 and 40.
c. The syllabus suggests that the top 15% of the students will get an A in the course. What is the minimum score required to get an A?
d. What is the passing score if 10% of the students will fail the course?

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