Solving probability problems based on empirical rule

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Question1: Scores on a University exam are normally distributed with a mean of 68 and a standard deviation of 9. Using the 68-95-99.7 rule, what percentage of students score above seventy-seven?

Question2: The time to complete a standardized exam is approximately normal with a mean of seventy minutes and a standard deviation of ten minutes. Using the 68-95-99.7 rule, if students are given 90 minutes to complete the exam, what percentage of students will not finish?

Reference no: EM1321143

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