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The Connecticut State Highway Patrol claims that the average speed of the 2000 cars driving Interstate 91 from Hartford to New Haven on June 20 between 10:00AM and 11:00AM is 71 mph with a standard deviation of 5 mph. By coincidence the Connecticut Safety Council sampled 50 cars on Interstate 91 from Hartford to New Haven on June 20 between 10:00AM and 11:00AM and found the average speed was 73 mph. What is probability of finding a sample mean of 73 mph or more?

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