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QUESTION
Scores on the ACT college entrance exam follow a Normal distribution with mean 18 and standard deviation 6. Wayne and Clayton are both taking the...
Scores on the ACT college entrance exam follow a Normal distribution with mean 18 and standard deviation 6. Wayne and Clayton are both taking the exam this year. What is closest to the probability that their average score is above 20? You can assume their scores are iid random variables from the population.
