The time required to complete a final exam in a particular college course is normally distributed with an average of 83 minutes and a standard deviation of 13 minutes. Answer the following questions. What is the probability of completing the exam in one hour or less (to 4 decimal places)?
What is the probability that a student completes the exam in more than 60 minutes but less than 75 minutes (to 4 decimal places)?
Suppose the class has 60 students and the exam period lasts 90 minutes. How many students do you think will be unable to complete the exam in the allotted time (rounded up to the nearest whole number)? The best webpage for this kind of problem on the whole internet
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