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4. The time needed to complete final examination in a particular college course is normally distributed with a mean of 80 minutes and standard deviation

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4. The time needed to complete final examination in a particular college course is normally distributed with a mean of 80 minutes and standard deviation 10 minutes i. What is the probability of completing the exam in one hour or less ? Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time

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