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Scores on a certain assessment test had a mean of 280 and a standard deviation of 31.5. A random sample of 49 students taking this

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Scores on a certain assessment test had a mean of 280 and a standard deviation of 31.5. A random sample of 49 students taking this test is selected. Find the probability that the sample mean score is at least 289. A. 0.3859 B. 0.0228 C. 0.6141 D. 0.2500 E. 0.9772

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