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Question 20 options: The MAX light rail in Portland, OR has a waiting time that is normally distributed with a mean waiting time of 5

Question 20 options:

The MAX light rail in Portland, OR has a waiting time that is normally distributed with a mean waiting time of 5 minutes with a standard deviation of 2.9 minutes. A random sample of 40 wait times was selected, what is the probability the sample mean wait time is under 4 minutes?

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