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The times it takes students to finish an exam is normally distributed, with a mean of 85 minutes, and a standard deviation of 18 minutes.

The times it takes students to finish an exam is normally distributed, with a mean of 85 minutes, and a standard deviation of 18 minutes. a. What is the chance a student takes at least 75 minutes? b. If a random sample of 53 students is taken, what is the chance their average time is less than 90 minutes? c. Find the 90th percentile of the times.

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