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The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of

The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Find the probability that the mean GPA of a random sample of 20 students selected from this university is 2.90 or lower.

P(x 2.90) =

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