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Scores on a marketing exam are known to be normally distribute with mean and standard deviation of 60 and 20, respectively.

Scores on a marketing exam are known to be normally distribute with mean and standard deviation of 60 and 20, respectively. 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? Denote X to be the random variable "score on the marketing exam", and x to be the minimum score to get an A, choose from the followings the correct way to set up for solving x:

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