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The final exam in a certain course has scores that are normally distributed with a mean of ?9.4 with a standard deviation of 6.2. If

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The final exam in a certain course has scores that are normally distributed with a mean of ?9.4 with a standard deviation of 6.2. If 23 students are randomly selected, find the probability that the mean of their final exam scores is less than 7'8. Round your answer 4 places after the decimal point

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