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Example: The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, a) what percentage of students will complete the exam in under an hour? b) what percentage of students will complete the exam between 60 minutes and 70 minutes? 17 of 27 c) in what time interval would you expect the central 95% of students to be found?

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