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The distribution of scores on a standardized test is approximately normal with a standard deviation of20. Suppose a sample of 90 students had a mean

The distribution of scores on a standardized test is approximately normal with a standard deviation of20. Suppose a sample of 90 students had a mean score of73.6.

Find the margin of error fora 99% confidence interval for the mean score of all students on this test. Round your answer to two decimal places.

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