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.

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