The time required to complete a final exam in statistics is normally distributed with a mean of 120 minutes and a standard deviation of 8 minutes. a) Determine the probability that a randomly selected...

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Extracted text: The time required to complete a final exam in statistics is normally distributed with a mean of 120 minutes and a standard deviation of 8 minutes. a) Determine the probability that a randomly selected student taking this course completes the exam in less than 115 minutes. b) Suppose a random sample of 9 students taking this course is selected. i) Calculate the mean and standard deviation of the sampling distribution of x. ii) Find the probability that the sample mean completion time is less than 115 minutes.